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51. Precise measurements of beam spin asymmetries in semi-inclusive π0 production

Author: J. McAndrew, E. De Sanctis, E. Voutier, Michael Wood, K. Hafidi, Y. Prok, M. Aghasyan, D. I. Sober, S. Strauch, S. S. Stepanyan, D. P. Watts, R. Dupre, P. Eugenio, H. Egiyan, D. Keller, N. D. Kvaltine, F. Sabatié, M. Battaglieri, W. Gohn, M. Taiuti, S. Tkachenko, L. Guo, M. Khandaker, G. E. Dodge, H. Y. Lu, M. Y. Gabrielyan, D. Adikaram, M. Guidal, H. Avakian, M. Anghinolfi, E. Munevar, M. Holtrop, R. De Vita, Victor Mokeev, H. Seraydaryan, G. Rosner, C. E. Taylor, I. Niculescu, N. Guler, M. Ungaro, Y. G. Sharabian, A. Daniel, P. Nadel-Turonski, Luciano Pappalardo, W. J. Briscoe, V. Crede, S. Anefalos Pereira, D. Schott, J. P. Ball, S. Chandavar, D. S. Carman, A. M. Micherdzinska, E. Pasyuk, V. Kuznetsov, E. Seder, E. Golovatch, A. El Alaoui, H. Voskanyan, Y. Ilieva, A. I. Ostrovidov, K. Park, M. J. Amaryan, E. L. Isupov, Z. W. Zhao, N. Gevorgyan, K. Joo, George Davey Smith, D. G. Ireland, R. A. Schumacher, A. Ni, Sergey Kuleshov, S. E. Kuhn, S. Procureur, L. Graham, C. Djalali, V. P. Kubarovsky, B. McKinnon, C. E. Hyde, O. Pogorelko, Volker D. Burkert, A. S. Biselli, S. Bültmann, S. Park, B. Guegan, R. W. Gothe, Lorenzo Zana, S. Stepanyan, S. Fegan, P. Rossi, D. Branford, H. S. Jo, K. L. Giovanetti, Avraham Klein, M. Mirazita, I. I. Strakovsky, P. Khetarpal, C. Salgado, A. Fradi, S. Niccolai, A. Deur, W. Kim, Larry Weinstein, V. Batourine, Martin K. Mayer, P. L. Cole, N. Dashyan, G. Niculescu, H. Moutarde, B. Moreno, M. S. Saini, P. Stoler, K. Livingston, D. Doughty, H. Baghdasaryan, Gerard Gilfoyle, M. Contalbrigo, R. Dickson, Jie Zhang, G. Ricco, I. Bedlinskiy, N. Markov, B. Dey, R. Paremuzyan, M. Paolone, Friedrich Klein, S. Pisano, D. Protopopescu, Brian Raue, S. Pozdniakov, M. Garçon, K. Hicks, A. Kim, D. Rimal, W. Tang, M. Osipenko, B. Zhao, S. S. Jawalkar, I. J. D. MacGregor, D. Hasch, E. Phelps, D. G. Jenkins, F. X. Girod, A. DʼAngelo, J. W. Price, M. Ripani, C. Hanretty, J. T. Goetz, R. P. Bennett, Latifa Elouadrhiri, C. A. Meyer, G. V. Fedotov, D. P. Weygand, K. A. Griffioen, P. Collins, Département de Physique Nucléaire (ex SPhN) (DPHN), Institut de Recherches sur les lois Fondamentales de l'Univers (IRFU), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, Institut de Physique Nucléaire d'Orsay (IPNO), Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11), Laboratoire de Physique Subatomique et de Cosmologie (LPSC), Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Institut Polytechnique de Grenoble - Grenoble Institute of Technology-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Joseph Fourier - Grenoble 1 (UJF)-Centre National de la Recherche Scientifique (CNRS), Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), and Université Joseph Fourier - Grenoble 1 (UJF)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Institut Polytechnique de Grenoble - Grenoble Institute of Technology-Centre National de la Recherche Scientifique (CNRS)
Subjects: Nuclear and High Energy Physics, Angular momentum, Particle physics, DEEP-INELASTIC SCATTERING, FINAL-STATE INTERACTIONS, PION ELECTROPRODUCTION, PARTON DISTRIBUTIONS, DRELL-YAN, LEPTOPRODUCTION, DEPENDENCE, Meson, media_common.quotation_subject, Nuclear Theory, Inelastic scattering, 01 natural sciences, Asymmetry, Settore FIS/04 - Fisica Nucleare e Subnucleare, High Energy Physics - Experiment, Nuclear physics, Pion, 0103 physical sciences, [PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex], Nuclear Experiment, 010306 general physics, QC, media_common, Physics, 010308 nuclear & particles physics, Deep inelastic scattering, Amplitude, Physics::Accelerator Physics, High Energy Physics::Experiment, Lepton
Abstract: We present studies of single-spin asymmetries for neutral pion electroproduction in semi-inclusive deep-inelastic scattering of 5.776 GeV polarized electrons from an unpolarized hydrogen target, using the CEBAF Large Acceptance Spectrometer (CLAS) at the Thomas Jefferson National Accelerator Facility. A substantial $\sin \phi_h$ amplitude has been measured in the distribution of the cross section asymmetry as a function of the azimuthal angle $\phi_h$ of the produced neutral pion. The dependence of this amplitude on Bjorken $x$ and on the pion transverse momentum is extracted with significantly higher precision than previous data and is compared to model calculations., Comment: to be submitted PLB
Published: 2011

52. Moments of the spin structure functions g1p and g1d for 0.05<Q2<3.0 GeV2

Author: R. A. Schumacher, G. V. O'Rielly, C. D. Keith, Cynthia Marie Hadjidakis, Z. W. Zhao, Chaden Djalali, D. G. Jenkins, Michael Dugger, S. Tkachenko, H. O. Funsten, A. I. Ostrovidov, A. C S Lima, S. Bültmann, L. Morand, M. R. Niroula, T. A. Forest, D. G. Ireland, G. Asryan, Volker D. Burkert, A. S. Biselli, J. Pierce, Elton Smith, M. J. Amaryan, M. MacCormick, O. P. Dzyubak, R. A. Niyazov, I. Hleiqawi, S. L. Careccia, Larry Weinstein, Avraham Klein, E. Golovatch, H. G. Juengst, K. Moriya, Daniel S. Carman, J. Kuhn, Philip L. Cole, S. McAleer, H. Hakobyan, S. Anefalos Pereira, P. D. Rubin, L. Blaszczyk, P. Corvisiero, Y. G. Sharabian, A. Fradi, L. Cheng, G. Audit, A.V. Stavinsky, C. E. Hyde-Wright, F. Sabatié, Nikolay Shvedunov, D. Heddle, P. Stoler, Friedrich Klein, J. P. Cummings, R. De Vita, N. Markov, V. Sapunenko, C. Salgado, Dinko Pocanic, L. Elouadrhiri, N. Kalantarians, S. Stepanyan, K. S. Egiyan, R. C. Minehart, C. A. Meyer, J. Ball, M. Taiuti, S. E. Kuhn, I. I. Strakovsky, M. Bektasoglu, M. Kossov, K. Mikhailov, K.H. Hicks, R. J. Feuerbach, G. V. Fedotov, M. Nozar, A. Deur, I. Popa, V. Crede, J. W. Price, Shifeng Chen, M. Anghinolfi, Laird Kramer, D. P. Watts, H. Egiyan, G. Gavalian, John A. Mueller, L. Casey, B. L. Berman, P. Mattione, B. B. Niczyporuk, G. Rosner, N. Benmouna, N. Pivnyuk, Kwangsoo Kim, J. T. Goetz, M. Mirazita, G. Riccardi, J. R. Calarco, R. A. Miskimen, B. A. Raue, B. McKinnon, W. J. Briscoe, L. M. Qin, R. G. Fersh, P. Eugenio, J. Langheinrich, C. Butuceanu, C. Hanretty, S. S. Stepanyan, E. Pasyuk, S. A. Philips, M. Ripani, G. Ricco, S. A. Morrow, C. Paterson, Y. Ilieva, Michael Vineyard, Victor Mokeev, M. Klusman, B. M. Preedom, D. Branford, P. Collins, B. Moreno, J. R. Johnstone, Lorenzo Zana, J. P. Santoro, Tsutomu Mibe, Gerald Feldman, J. M. Laget, L. Todor, D. Protopopescu, K. L. Giovanetti, S. V. Kuleshov, C. Marchand, S. Pozdniakov, M. Garçon, M. L. Seely, Ji Li, D. J. Tedeschi, G. E. Dodge, H. Y. Lu, J. Lachniet, I. Bedlinskiy, Marco A. Huertas, A. Tkabladze, M. D. Mestayer, E. L. Isupov, P. V. Degtyarenko, D. Rowntree, K. Livingston, Michael L. Williams, M. Holtrop, R. Suleiman, V. Kuznetsov, D. S. Dale, J. Zhang, S. Boiarinov, D. I. Sober, Gerard Gilfoyle, F. X. Girod, G. S. Mutchler, N. A. Baltzell, I. Niculescu, D. Sokhan, J. Salamanca, K. A. Griffioen, D. Lawrence, M. Guillo, N. Guler, R. De Masi, L. El Fassi, J. W C McNabb, Sylvain Bouchigny, H. Denizli, M. Guidal, M. Battaglieri, J. Hardie, S. Strauch, J. D. Kellie, Z. Krahn, R. Nasseripour, S. Barrow, P. Rossi, R. Dickson, N. Baillie, D. Doughty, V. Gyurjyan, R. Bradford, K. Lukashin, B. E. Stokes, G. S. Adams, H. Bagdasaryan, P. Nadel-Turonski, A. V. Skabelin, K. Joo, A. Cazes, S. Procureur, Maryam Moteabbed, Bernhard Mecking, K. V. Dharmawardane, L. Guo, M. Ungaro, D. P. Weygand, E. Wolin, N. Hassall, M. Bellis, D. G. Crabb, J. Yun, D. Cords, P. Bosted, A. Yegneswaran, N. Dashyan, Y. Prok, Barry Ritchie, E. De Sanctis, H. S. Jo, S. Niccolai, R. Fatemi, A. V. Vlassov, P. Coltharp, R. W. Gothe, M. M. Ito, K. Y. Kim, M. Osipenko, K. Beard, L. C. Smith, E. Munevar, Kalvir S. Dhuga, B. S. Ishkhanov, O. Pogorelko, M. Khandaker, B. Zhao, F. W. Hersman, W. Kim, G. Niculescu, N. Gevorgyan, L. C. Dennis, B. E. Bonner, H. Avakian, D. Sharov, S. A. Dytman, W. K. Brooks, K. Park, V. P. Kubarovsky, J. Shaw, Michael Wood, K. Hafidi, and V. S. Serov
Subjects: Physics, Nuclear and High Energy Physics, Chiral perturbation theory, Heavy baryon chiral perturbation theory, Proton, 010308 nuclear & particles physics, Nuclear Theory, Hadron, 01 natural sciences, Baryon, Nuclear physics, Polarizability, 0103 physical sciences, Sum rule in quantum mechanics, Nuclear Experiment, 010306 general physics, Nucleon
Abstract: The spin structure functions g 1 for the proton and the deuteron have been measured over a wide kinematic range in x and Q 2 using 1.6 and 5.7 GeV longitudinally polarized electrons incident upon polarized NH3 and ND3 targets at Jefferson Lab. Scattered electrons were detected in the CEBAF Large Acceptance Spectrometer, for 0.05 Q 2 5 GeV 2 and W 3 GeV . The first moments of g 1 for the proton and deuteron are presented – both have a negative slope at low Q 2 , as predicted by the extended Gerasimov–Drell–Hearn sum rule. The first extraction of the generalized forward spin polarizability of the proton γ 0 p is also reported. This quantity shows strong Q 2 dependence at low Q 2 . Our analysis of the Q 2 evolution of the first moment of g 1 shows agreement in leading order with Heavy Baryon Chiral Perturbation Theory. However, a significant discrepancy is observed between the γ 0 p data and Chiral Perturbation calculations for γ 0 p , even at the lowest Q 2 .
Published: 2009

53. Exclusive ρ0 electroproduction on the proton at CLAS

Author: J. Langheinrich, S. S. Stepanyan, E. Pasyuk, S. A. Philips, N. Dashyan, V. Sapunenko, G. Ricco, Alexei V. Klimenko, N. A. Baltzell, C. Salgado, Dinko Pocanic, Barry Ritchie, H. Denizli, A. V. Skabelin, K. A. Griffioen, B. Zhao, V. Gyurjyan, A. I. Ostrovidov, R. Fatemi, K. Park, S. E. Kuhn, Latifa Elouadrhiri, R. C. Minehart, Kei Moriya, C. A. Meyer, H. G. Juengst, B. E. Stokes, G. S. Adams, G. V. Fedotov, V. P. Kubarovsky, J. Zhang, P. Eugenio, K. P. Adhikari, A. V. Vlassov, D. P. Weygand, G. E. Dodge, H. Y. Lu, M. J. Amaryan, G. V. O'Rielly, S. Niccolai, Z. W. Zhao, V. Mokeev, Y. Ilieva, Ji Li, D. G. Jenkins, C. Tur, Gerard Gilfoyle, Elton Smith, H. Hakobyan, A.V. Stavinsky, J. D. Kellie, M. Guidal, M. MacCormick, I. Hleiqawi, S. L. Careccia, R. De Vita, Friedrich Klein, Brian Raue, P. V. Degtyarenko, M. D. Mestayer, J. P. Didelez, R. Nasseripour, L. Todor, F. W. Hersman, P. Coltharp, E. L. Isupov, J. P. Cummings, W. Gohn, S. A. Morrow, S. McAleer, M. Anghinolfi, P. Nadel-Turonski, D. Sokhan, D. Protopopescu, D. J. Tedeschi, M. Holtrop, Michael L. Williams, P. Collins, K. L. Giovanetti, I. Niculescu, F. X. Girod, L. Blaszczyk, B. Carnahan, James Mueller, D. Lawrence, R. G. Fersch, R. A. Miskimen, B. McKinnon, S. Pozdniakov, M. Garçon, J. J. Melone, M. M. Ito, S. Boiarinov, Larry Weinstein, L. Zana, P. D. Rubin, R. De Masi, D. Keller, I. Bedlinskiy, B. M. Preedom, S. Anefalos Pereira, D. Schott, Y. G. Sharabian, R. A. Schumacher, P. L. Cole, M. Yurov, M. Taiuti, S. Mehrabyan, D. Branford, L. C. Smith, E. Munevar, G. S. Mutchler, B. S. Ishkhanov, Michael Wood, K. Hafidi, L. Graham, M. Kossov, M. E. McCracken, C. I O Gordon, J. M. Laget, V. Kuznetsov, J. Kuhn, E. Hourany, M. Khandaker, V. S. Serov, L. C. Dennis, B. E. Bonner, J. W. Price, Tsutomu Mibe, S. Bültmann, G. Audit, Shifeng Chen, C. Bookwalter, N. Gevorgyan, M. Osipenko, C. E. Hyde-Wright, J. P. Santoro, H. S. Jo, H. Avakian, L. Morand, I. Popa, D. Sharov, T. A. Forest, G. Riccardi, M. R. Niroula, E. De Sanctis, O. Pogorelko, S. Stepanyan, P. Mattione, C. Butuceanu, M. S. Saini, D. Doughty, J. Pierce, M. Ripani, B. L. Berman, Avraham Klein, L. M. Qin, M. Aghasyan, E. Wolin, Sergey Kuleshov, W. J. Briscoe, D. Heddle, J. T. Goetz, D. I. Sober, Kalvir S. Dhuga, M. Bektasoglu, S. A. Dytman, S. Dhamija, M. Nozar, E. Polli, M. Mirazita, C. Paterson, J. P. Ball, R. W. Gothe, Y. Prok, B. Moreno, W. Kim, J. Hardie, Hall Crannell, D. S. Carman, K. Livingston, G. Rosner, C. Marchand, G. Niculescu, D. S. Dale, N. Baillie, S. Park, Sylvain Bouchigny, J. Lachniet, A. Tkabladze, D. G. Crabb, R. Dickson, Michael Vineyard, D. G. Ireland, V. Crede, J. R. Calarco, P. Khetarpal, N. Guler, J. Salamanca, L. El Fassi, J. W C McNabb, S. Barrow, P. Rossi, L. Casey, H. Bagdasaryan, Volker D. Burkert, A. S. Biselli, B. B. Niczyporuk, N. Pivnyuk, P. Stoler, C. Hanretty, Laird Kramer, J. R. Johnstone, L. Guo, M. Ungaro, A. Fradi, K. Joo, D. Cords, N. Markov, A. Yegneswaran, K. Hicks, M. Battaglieri, R. Bradford, K. S. Egiyan, A. Cazes, S. Procureur, Maryam Moteabbed, Bernhard Mecking, K. V. Dharmawardane, N. Hassall, M. Bellis, K. Mikhailov, G. Asryan, O. P. Dzyubak, R. A. Niyazov, P. Corvisiero, S. Strauch, D. P. Watts, H. Egiyan, I. I. Strakovsky, A. Deur, W. K. Brooks, R. J. Feuerbach, Cynthia Marie Hadjidakis, M. Guillo, Chaden Djalali, Michael Dugger, L. Cheng, F. Sabatié, Nikolay Shvedunov, N. Kalantarians, G. Gavalian, S. Tkachenko, and N. Benmouna
Subjects: Quark, Physics, REPRESENTATION, Nuclear and High Energy Physics, Particle physics, Valence (chemistry), Proton, Hadron, Parton, VECTOR-MESON ELECTROPRODUCTION, Approx, PHOTONS, QCD, EVOLUTION, High Energy Physics - Experiment, Regge theory, Nuclear physics, Scattering amplitude, GENERALIZED PARTON DISTRIBUTIONS, VIRTUAL COMPTON-SCATTERING, VECTOR-MESON ELECTROPRODUCTION, LARGE MOMENTUM-TRANSFER, DIFFRACTIVE PRODUCTION, PHOTOPRODUCTION, PHOTONS, QCD, REPRESENTATION, EVOLUTION, LARGE MOMENTUM-TRANSFER, GENERALIZED PARTON DISTRIBUTIONS, DIFFRACTIVE PRODUCTION, PHOTOPRODUCTION, Nuclear Experiment, VIRTUAL COMPTON-SCATTERING
Abstract: The $e p\to e^\prime p \rho^0$ reaction has been measured, using the 5.754 GeV electron beam of Jefferson Lab and the CLAS detector. This represents the largest ever set of data for this reaction in the valence region. Integrated and differential cross sections are presented. The $W$, $Q^2$ and $t$ dependences of the cross section are compared to theoretical calculations based on $t$-channel meson-exchange Regge theory on the one hand and on quark handbag diagrams related to Generalized Parton Distributions (GPDs) on the other hand. The Regge approach can describe at the $\approx$ 30% level most of the features of the present data while the two GPD calculations that are presented in this article which succesfully reproduce the high energy data strongly underestimate the present data. The question is then raised whether this discrepancy originates from an incomplete or inexact way of modelling the GPDs or the associated hard scattering amplitude or whether the GPD formalism is simply inapplicable in this region due to higher-twists contributions, incalculable at present., Comment: 29 pages, 29 figures
Published: 2008

54. Measurements ofep→e′π+nat1.6<W<2.0 GeV and extraction of nucleon resonance electrocouplings at CLAS

Author: B. S. Ishkhanov, I. Zonta, J. Bono, P. Nadel-Turonski, X. Wei, E. De Sanctis, P. Eugenio, M. Taiuti, K. A. Griffioen, B. Garillon, Z. W. Zhao, C. E. Hyde, A. Filippi, D. Protopopescu, A. Kim, M. Garçon, S. Niccolai, A. Trivedi, Andrew Puckett, J. T. Goetz, F. X. Girod, Michael Paolone, I. I. Strakovsky, V. Crede, L. Guo, R. A. Schumacher, Sergey Kuleshov, M. Khandaker, Alessandro Rizzo, S. Chandavar, W. Tang, G. Charles, A. Deur, M. Osipenko, Latifa Elouadrhiri, Gerard Gilfoyle, Nikolaos Sparveris, M. Battaglieri, W. K. Brooks, A. Simonyan, R. De Vita, R. A. Montgomery, D. Martinez, B. Guegan, H. Hakobyan, C. Hanretty, C. E. Taylor, K. Livingston, N. Dashyan, G. V. Fedotov, S. Strauch, V. Sytnik, E. Golovatch, R. Dupre, Avraham Klein, H. S. Jo, Jie Zhang, S. Anefalos Pereira, V. Mokeev, P. Lenisa, V. P. Kubarovsky, H. S. Joo, H. Y. Lu, W. Phelps, Eugene Pasyuk, Inna Aznauryan, O. Pogorelko, S. M. Hughes, K. P. Adhikari, I. Bedlinskiy, C. Salgado, P. Roy, S. E. Kuhn, P. Peng, Hovanes Egiyan, C. Munoz Camacho, W. Kim, J. A. Fleming, M. Guidal, G. Niculescu, Yordanka Ilieva, H. Avakian, C. Djalali, K. Park, M. Ripani, I. Niculescu, B. McKinnon, P. Rossi, M. J. Amaryan, S. Joosten, G. D. Smith, M. Holtrop, Friedrich Klein, A. El Alaoui, M. Hattawy, Brian Raue, L. Zana, G. Rosner, H. Voskanyan, Nicholas Zachariou, Elton Smith, D. G. Jenkins, W. J. Briscoe, E. Seder, F. Sabatié, P. Stoler, D. P. Watts, S. Procureur, H. Moutarde, Dustin Keller, M. Ungaro, Michael Wood, K. Hicks, Y. G. Sharabian, K. Joo, O. Cortes, E. L. Isupov, Ye Tian, J. W. Price, K. L. Giovanetti, S. Fegan, Iu. Skorodumina, Larry Weinstein, D. Doughty, Y. Prok, D. S. Carman, E. Voutier, M. Contalbrigo, R. A. Badui, A. Celentano, R. W. Gothe, N. K. Walford, J. J. Phillips, I. J. D. MacGregor, A. D'Angelo, L. El Fassi, R. G. Fersch, Diane Schott, P. L. Cole, A. I. Ostrovidov, N. Gevorgyan, D. G. Ireland, H. Jiang, Volker D. Burkert, A. S. Biselli, L. Colaneri, N. Markov, and S. Pisano
Subjects: Physics, Quark, Nuclear and High Energy Physics, Particle physics, Amplitude, Isospin, Quark model, Isobar, Resonance, Invariant mass, Nucleon
Abstract: Differential cross sections of the exclusive process $ep\ensuremath{\rightarrow}{e}^{\ensuremath{'}}{\ensuremath{\pi}}^{+}n$ were measured with good precision in the range of the photon virtuality ${Q}^{2}=1.8--4.5$ ${\mathrm{GeV}}^{2}$ and the invariant mass range of the ${\ensuremath{\pi}}^{+}n$ final state $W=1.6--2.0$ GeV using the Continuous Electron Beam Accelerator Facility Large Acceptance Spectrometer. Data were collected with nearly complete coverage in the azimuthal and polar angles of the $n{\ensuremath{\pi}}^{+}$ center-of-mass system. More than 37 000 cross-section points were measured. The contributions of the isospin $I=\frac{1}{2}$ resonances $N(1675){\frac{5}{2}}^{\ensuremath{-}},N(1680){\frac{5}{2}}^{+}$, and $N(1710){\frac{1}{2}}^{+}$ were extracted at different values of ${Q}^{2}$ using a single-channel, energy-dependent resonance amplitude analysis. Two different approaches, the unitary isobar model and the fixed-$t$ dispersion relations, were employed in the analysis. We observe significant strength of the $N(1675){\frac{5}{2}}^{\ensuremath{-}}$ in the ${A}_{1/2}$ amplitude, which is in strong disagreement with quark models that predict both transverse amplitudes to be strongly suppressed. For the $N(1680){\frac{5}{2}}^{+}$ we observe a slow changeover from the dominance of the ${A}_{3/2}$ amplitude at the real photon point $({Q}^{2}=0)$ to a ${Q}^{2}$ where ${A}_{1/2}$ begins to dominate. The scalar amplitude ${S}_{1/2}$ drops rapidly with ${Q}^{2}$ consistent with quark model prediction. For the $N(1710){\frac{1}{2}}^{+}$ resonance our analysis shows significant strength for the ${A}_{1/2}$ amplitude at ${Q}^{2}l2.5$ ${\mathrm{GeV}}^{2}$.
Published: 2015

55. Single and double spin asymmetries for deeply virtual Compton scattering measured with CLAS and a longitudinally polarized proton target

Author: M. Contalbrigo, R. A. Schumacher, P. Bosted, Andrew Puckett, A. Kim, P. Stoler, S. Chandavar, J. P. Ball, Y. Prok, E. Golovatch, I. Zonta, P. Roy, D. Adikaram, M. Guidal, B. S. Ishkhanov, Nikolaos Sparveris, B. Briscoe, K. Hicks, N. Compton, M. Garçon, Iu. Skorodumina, A. Rizzo, X. Wei, S. Joosten, G. D. Smith, M. Holtrop, V. Sytnik, M. Mirazita, P. Nadel-Turonski, A. El Alaoui, O. Cortes, C. D. Keith, Ye Tian, J. J. Phillips, S. Niccolai, D. G. Crabb, Nicholas Zachariou, P. Lenisa, S. Tkachenko, S. Stepanyan, R. Dupre, L. Guo, M. Ripani, D. P. Watts, I. J. D. MacGregor, E. De Sanctis, J. Brock, R. De Vita, S. Fegan, R. W. Gothe, M. Osipenko, William Brooks, J. T. Goetz, Latifa Elouadrhiri, O. Pogorelko, Z. W. Zhao, Diane Schott, C. A. Meyer, M. Ungaro, D. I. Sober, A. I. Ostrovidov, K. Park, Hovanes Egiyan, M. Battaglieri, C. Munoz Camacho, G. V. Fedotov, A. Deur, K. A. Griffioen, V. Crede, D. G. Ireland, W. Phelps, Lorenzo Zana, C. I. Moody, H. Y. Lu, Volker D. Burkert, A. S. Biselli, B. McKinnon, Friedrich Klein, K. P. Adhikari, D. G. Jenkins, C. Hanretty, R. A. Montgomery, L. Colaneri, C. Salgado, G. Charles, H. S. Jo, A. Fradi, S. E. Kuhn, W. Kim, V. Batourine, M. Hattawy, Chaden Djalali, J. A. Fleming, G. Rosner, I. Bedlinskiy, M. Turisini, F. Sabatié, E. Seder, S. Strauch, K. Joo, K. Livingston, W. Gohn, J. W. Price, Y. Ghandilyan, C. Carlin, S. Pisano, Gerard Gilfoyle, S. Anefalos Pereira, M. Mayer, D. S. Carman, D. Sokhan, Andrea Celentano, R. Fersch, Victor Mokeev, H. Avakian, E. Voutier, P. Rossi, J. Zhang, N. K. Walford, X. Jiang, V. P. Kubarovsky, D. G. Meekins, Annalisa D'Angelo, S. M. Hughes, L. El Fassi, Michael Wood, K. Hafidi, P. L. Cole, P. Eugenio, F. X. Girod, S. Procureur, B. Garillon, Y. Ilieva, M. J. Amaryan, M. MacCormick, K. L. Giovanetti, Larry Weinstein, D. Keller, A. Filippi, Institut de Physique Nucléaire d'Orsay (IPNO), Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Laboratoire de Physique Subatomique et de Cosmologie (LPSC), Université Joseph Fourier - Grenoble 1 (UJF)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Institut Polytechnique de Grenoble - Grenoble Institute of Technology-Centre National de la Recherche Scientifique (CNRS), Département de Physique Nucléaire (ex SPhN) (DPHN), Institut de Recherches sur les lois Fondamentales de l'Univers (IRFU), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, CLAS Collaboration, Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11), and Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Institut Polytechnique de Grenoble - Grenoble Institute of Technology-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Joseph Fourier - Grenoble 1 (UJF)-Centre National de la Recherche Scientifique (CNRS)
Subjects: Quark, Nuclear and High Energy Physics, Particle physics, Photon, Meson, FOS: Physical sciences, Parton, Kinematics, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 01 natural sciences, Settore FIS/04 - Fisica Nucleare e Subnucleare, NO, High Energy Physics - Experiment, Nuclear physics, High Energy Physics - Experiment (hep-ex), GENERALIZED PARTON DISTRIBUTIONS, 0103 physical sciences, [PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex], Nuclear Experiment (nucl-ex), NUCLEON, 010306 general physics, Nuclear Experiment, Quantum chromodynamics, Physics, 010308 nuclear & particles physics, ELECTROPRODUCTION, MESONS, QCD, Compton scattering, High Energy Physics::Experiment, Nucleon
Abstract: Single-beam, single-target, and double-spin asymmetries for hard exclusive photon production on the proton $\vec{e}\vec{p} \to e' p'\gamma$ are presented. The data were taken at Jefferson Lab using the CLAS detector and a longitudinally polarized ${}^{14}$NH$_3$ target. The three asymmetries were measured in 165 4-dimensional kinematic bins, covering the widest kinematic range ever explored simultaneously for beam and target-polarization observables in the valence quark region. The kinematic dependences of the obtained asymmetries are discussed and compared to the predictions of models of Generalized Parton Distributions. The measurement of three DVCS spin observables at the same kinematic points allows a quasi-model-independent extraction of the imaginary parts of the $H$ and $\tilde{H}$ Compton Form Factors, which give insight into the electric and axial charge distributions of valence quarks in the proton., Comment: 28 pages, 25 figures
Published: 2015

56. Cross Sections for the Exclusive Photon Electroproduction on the Proton and Generalized Parton Distributions

Author: H S, Jo, F X, Girod, H, Avakian, V D, Burkert, M, Garçon, M, Guidal, V, Kubarovsky, S, Niccolai, P, Stoler, K P, Adhikari, D, Adikaram, M J, Amaryan, M D, Anderson, S, Anefalos Pereira, J, Ball, N A, Baltzell, M, Battaglieri, V, Batourine, I, Bedlinskiy, A S, Biselli, S, Boiarinov, W J, Briscoe, W K, Brooks, D S, Carman, A, Celentano, S, Chandavar, G, Charles, L, Colaneri, P L, Cole, N, Compton, M, Contalbrigo, V, Crede, A, D'Angelo, N, Dashyan, R, De Vita, E, De Sanctis, A, Deur, C, Djalali, R, Dupre, A El, Alaoui, L El, Fassi, L, Elouadrhiri, G, Fedotov, S, Fegan, A, Filippi, J A, Fleming, B, Garillon, N, Gevorgyan, Y, Ghandilyan, G P, Gilfoyle, K L, Giovanetti, J T, Goetz, E, Golovatch, R W, Gothe, K A, Griffioen, B, Guegan, N, Guler, L, Guo, K, Hafidi, H, Hakobyan, N, Harrison, M, Hattawy, K, Hicks, N, Hirlinger Saylor, D, Ho, M, Holtrop, S M, Hughes, Y, Ilieva, D G, Ireland, B S, Ishkhanov, D, Jenkins, K, Joo, S, Joosten, D, Keller, G, Khachatryan, M, Khandaker, A, Kim, W, Kim, A, Klein, F J, Klein, S E, Kuhn, S V, Kuleshov, P, Lenisa, K, Livingston, H Y, Lu, I J D, MacGregor, B, McKinnon, Z E, Meziani, M, Mirazita, V, Mokeev, R A, Montgomery, H, Moutarde, A, Movsisyan, E, Munevar, C, Munoz Camacho, P, Nadel-Turonski, L A, Net, G, Niculescu, M, Osipenko, A I, Ostrovidov, M, Paolone, K, Park, E, Pasyuk, J J, Phillips, S, Pisano, O, Pogorelko, J W, Price, S, Procureur, Y, Prok, A J R, Puckett, B A, Raue, M, Ripani, A, Rizzo, G, Rosner, P, Rossi, P, Roy, F, Sabatié, C, Salgado, D, Schott, R A, Schumacher, E, Seder, A, Simonyan, Iu, Skorodumina, G D, Smith, D, Sokhan, N, Sparveris, S, Stepanyan, I I, Strakovsky, S, Strauch, V, Sytnik, Ye, Tian, S, Tkachenko, M, Ungaro, H, Voskanyan, E, Voutier, N K, Walford, D P, Watts, X, Wei, L B, Weinstein, M H, Wood, N, Zachariou, L, Zana, J, Zhang, Z W, Zhao, I, Zonta, Institut de Physique Nucléaire d'Orsay (IPNO), Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11), Thomas Jefferson National Accelerator Facility (Jefferson Lab), Département de Physique Nucléaire (ex SPhN) (DPHN), Institut de Recherches sur les lois Fondamentales de l'Univers (IRFU), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, Rensselaer Polytechnic Institute (RPI), Old Dominion University [Norfolk] (ODU), Argonne National Laboratory [Lemont] (ANL), Universidad Tecnica Federico Santa Maria [Valparaiso] (UTFSM), University of Connecticut (UCONN), Ohio University, Carnegie Mellon University [Pittsburgh] (CMU), CLAS Collaboration, and Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)
Subjects: Particle physics, Photon, Proton, HERA, General Physics and Astronomy, Socio-culturale, FOS: Physical sciences, Parton, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], High Energy Physics - Experiment, Settore FIS/04 - Fisica Nucleare e Subnucleare, Nuclear physics, High Energy Physics - Experiment (hep-ex), CLAS, virtual compton scattering, Twist, Nuclear Experiment (nucl-ex), VIRTUAL COMPTON-SCATTERING, NUCLEON, Nuclear Experiment, Quantum chromodynamics, Physics, 3. Good health, Phase space, virtual compton scattering, nucleon, High Energy Physics::Experiment, Nucleon
Abstract: Unpolarized and beam-polarized four-fold cross sections $\frac{d^4 \sigma}{dQ^2 dx_B dt d\phi}$ for the $ep\to e^\prime p^\prime \gamma$ reaction were measured using the CLAS detector and the 5.75-GeV polarized electron beam of the Jefferson Lab accelerator, for 110 ($Q^2,x_B,t$) bins over the widest phase space ever explored in the valence-quark region. Several models of Generalized Parton Distributions (GPDs) describe the data well at most of our kinematics. This increases our confidence that we understand the GPD $H$, expected to be the dominant contributor to these observables. Through a leading-twist extraction of Compton Form Factors, these results reveal a tomographic image of the nucleon., Comment: 7 pages, 5 figures
Published: 2015

57. Measurement of the x- and Q2-dependence of the asymmetry A1 on the nucleon

Author: L. Elouadrhiri, R. A. Miskimen, M. Khandaker, B. McKinnon, G. Rosner, I. I. Strakovsky, R. W. Gothe, M. Bellis, D. Branford, P. Rossi, K. Y. Kim, A. Deur, S. V. Kuleshov, H. G. Juengst, K. S. Egiyan, P. V. Degtyarenko, P. Dragovitsch, M. Battaglieri, M. Nozar, D. J. Tedeschi, M. Taiuti, I. Bedlinskiy, L. Todor, J. P. Cummings, D. Doughty, F. X. Girod, S. Niccolai, D. Protopopescu, Laird Kramer, J. Hardie, V. Gyurjyan, R. De Masi, B. E. Stokes, F. Ronchetti, R. A. Schumacher, P. Corvisiero, V. P. Kubarovsky, G. S. Adams, D. Heddle, Brian Raue, M. Mirazita, G. Ricco, Dinko Pocanic, L. C. Smith, S. Tkachenko, R. Bradford, K. Lukashin, Y. G. Sharabian, O. Pogorelko, E. Wolin, S. McAleer, S. E. Kuhn, V. Sapunenko, B. S. Ishkhanov, Ji Li, Jean Laget, N. Benmouna, N. Pivnyuk, Rakhsha Nasseripour, B. Carnahan, L. C. Dennis, B. E. Bonner, M. Guillo, C. Tur, J. Napolitano, A. I. Ostrovidov, R. Fatemi, A. C S Lima, Gerard Gilfoyle, D. Cords, Marco A. Huertas, H. Avakian, E. S. Smith, K. Park, A. V. Vlassov, D. G. Ireland, M. R. Niroula, V. Batourine, B. Zhao, Y. Ilieva, E. L. Isupov, R. Suleiman, I. Hleiqawi, L. Guo, S. Bültmann, Volker D. Burkert, A. S. Biselli, H. S. Jo, E. Golovatch, Michael L. Williams, P. Bosted, S. L. Careccia, James Mueller, G. S. Mutchler, R. DeVita, M. Ripani, S. A. Morrow, Atilla Gonenc, M. MacCormick, C. Djalali, F. W. Hersman, T. A. Forest, M. Anghinolfi, P. D. Rubin, S. Stepanyan, A. Cazes, G. Gavalian, J. W. Price, S. Boiarinov, Maryam Moteabbed, B. M. Preedom, N. A. Baltzell, Sylvain Bouchigny, J. P. Ball, Y. Prok, K. L. Giovanetti, Michael Dugger, A. Yegneswaran, Shifeng Chen, K. V. Dharmawardane, J. Pierce, M. Kossov, Avraham Klein, Jens H. Kuhn, A. Stavinsky, Larry Weinstein, P. Ambrozewicz, E. Pasyuk, L. M. Qin, K. A. Griffioen, H. O. Funsten, P. Coltharp, U. Thoma, C. Keith, Lorenzo Zana, D. P. Weygand, S. A. Dytman, Hall Crannell, M. M. Ito, N. Baillie, J. T. Goetz, G. V. O'Rielly, C. Paterson, M. Klusman, K. Livingston, V. Crede, Z. W. Zhao, Frank Klein, D. G. Crabb, J. R. Calarco, S. Strauch, D. G. Jenkins, C. Salgado, J. D. Kellie, G. E. Dodge, S. Pozdniakov, N. Guler, J. W C McNabb, M. D. Mestayer, I. Niculescu, Nikolay Shvedunov, D. Lawrence, M. Guidal, D. I. Sober, S. S. Stepanyan, M. Osipenko, S. Barrow, F. Sabatié, Michael Vineyard, K. Beard, M. Garçon, B. Mecking, G. Riccardi, J. Shaw, C. Butuceanu, Michael Wood, W. K. Brooks, K. Hafidi, V. S. Serov, Victor Mokeev, M. Ungaro, K. Joo, J. Yun, J. P. Santoro, Roy Thompson, K. Kim, J. J. Manak, P. Eugenio, J. Zhang, H. Bagdasaryan, P. Collins, Daniel S. Carman, C. Hadjidakis, C. E. Hyde-Wright, M. Bektasoglu, J. Langheinrich, S. A. Philips, G. Niculescu, M. Holtrop, Hong Lu, P. L. Cole, P. Nadel-Turonski, Tsutomu Mibe, B. B. Niczyporuk, J. Lachniet, A. Tkabladze, D. Rowntree, R. S. Hakobyan, J. Donnelly, O. P. Dzyubak, R. A. Niyazov, R. J. Feuerbach, L. Morand, P. Stoler, E. De Sanctis, K. Hicks, W. Kim, Susan Taylor, K. Mikhailov, H. Egiyan, N. Markov, Barry Ritchie, G. Asryan, H. Denizli, A. V. Skabelin, R. C. Minehart, C. A. Meyer, G. V. Fedotov, and E. Polli
Subjects: Quark, Physics, Nuclear and High Energy Physics, Particle physics, Proton, 010308 nuclear & particles physics, media_common.quotation_subject, Momentum transfer, Quark model, Parton, 01 natural sciences, Asymmetry, Nuclear physics, 0103 physical sciences, Invariant mass, 010306 general physics, Nucleon, media_common
Abstract: We report results for the virtual photon asymmetry A{sub 1} on the nucleon from new Jefferson Lab measurements. The experiment, which used the CEBAF Large Acceptance Spectrometer and longitudinally polarized proton ({sup 15}NH{sub 3}) and deuteron ({sup 15}ND{sub 3}) targets, collected data with a longitudinally polarized electron beam at energies between 1.6 GeV and 5.7 GeV. In the present paper, we concentrate on our results for A{sub 1}(x,Q{sup 2}) and the related ratio g{sub 1}/F{sub 1}(x,Q{sup 2}) in the resonance and the deep inelastic regions for our lowest and highest beam energies, covering a range in momentum transfer Q{sup 2} from 0.05 to 5.0 GeV{sup 2} and in final-state invariant mass W up to about 3 GeV. Our data show detailed structure in the resonance region, which leads to a strong Q{sup 2}--dependence of A{sub 1}(x,Q{sup 2}) for W below 2 GeV. At higher W, a smooth approach to the scaling limit, established by earlier experiments, can be seen, but A{sub 1}(x,Q{sup 2}) is not strictly Q{sup 2}--independent. We add significantly to the world data set at high x, up to x = 0.6. Our data exceed the SU(6)-symmetric quark model expectation for both the proton and the deuteron whilemore » being consistent with a negative d-quark polarization up to our highest x. This data set should improve next-to-leading order (NLO) pQCD fits of the parton polarization distributions.« less
Published: 2006

58. Erratum to: 'Nuclear effects on R=σ/σ in deep-inelastic scattering'

Author: H. Avakian, Alan M. Nathan, F.H. Heinsius, E. R. Kinney, A. Avetisian, A. Jgoun, K. Ackerstaff, Klaus Rith, M. Henoch, P. Geiger, E. E. W. Bruins, C. Grosshauser, R. A. Ristinen, J. M. Niczyporuk, N. Meyners, A. Airapetian, Y. Naryshkin, A. Brull, Brons, A. Reali, P. Lenisa, A. Izotov, A. Gute, J. Seibert, T. Shin, V. Vikhrov, J.-O. Hansen, Manuella Vincter, V. A. Kozlov, H. Kolster, Igor Akushevich, A. Borissov, F. Garibaldi, J. van Hunen, B. W. Filippone, A.O. Mateos, S. Yoneyama, L. G. Greeniaus, Haiyan Gao, W. Lachnit, G. S. Kyle, Michael Tytgat, R. Mussa, B. D. Fox, Wolfgang Lorenzon, W.-D. Nowak, M. Kurisuno, M. Guidal, R. C. W. Henderson, S. Brauksiepe, Yasuhiro Sakemi, J. Blouw, M. Sutter, B. Tipton, M. Amarian, R. Openshaw, R. J. Holt, J.E. Belz, E. De Sanctis, E. C. Aschenauer, V. A. Korotkov, Hans von der Schmitt, V. Shutov, B. Bains, M. Ferstl, S. Taroian, G. P. Capitani, A. Kisselev, M. Kolstein, P. Rossi, G. van der Steenhoven, F. Masoli, J. Visser, M. Ruh, S. Belostotski, A. Golendukhin, Y. Gärber, S. Frullani, Jinsong Ouyang, C. Simani, Naomi C R Makins, Y. Holler, M. Nupieri, W. Hoprich, H. Tallini, F. Neunreither, U. Stoesslein, H. Fischer, M. Hartig, L. H. Kramer, Hiroaki Kobayashi, A. Fechtchenko, K. Fiedler, J. W. Martin, J. Wendland, D. Hasch, V. Gyurjian, E. Cisbani, O. Grebeniouk, E. Volk, Ralf Hertenberger, B. Bray, T. A. Shibata, K. Shibatani, K. Königsmann, Wolfgang Korsch, R.O. Avakian, P. F. Dalpiaz, H. Ihssen, T. Wise, S. Bernreuther, F. Meissner, K. Woller, F. Schmidt, O. Häusser, A. Schwind, M. Spengos, R. P. Redwine, M. Beckmann, J. F. J. van den Brand, I.A. Savin, D. De Schepper, A. Dvoredsky, J. P. Haas, P.W. Green, Miller, E. Devitsin, P. Kitching, H. E. Jackson, P.K.A. de Witt Huberts, Michael Pitt, R. D. McKeown, V. G. Krivokhijine, G.R. Court, G. Elbakian, Andreas Schäfer, W. Brückner, M. McAndrew, C. Baumgarten, Ralf Kaiser, B. R. Owen, Ross Milner, F. K. Martens, C. Scarlett, E. Steffens, G. Gavrilov, Valeria Muccifora, A. Nagaitsev, Alessandra Fantoni, Michael Düren, P. Chumney, G. Graw, Michel Vetterli, A. Simon, M. Bouwhuis, H. Böttcher, S. F. Pate, H. J. Bulten, J. Stewart, N. Akopov, W. Wander, K. Sinram, V. Gharibyan, Mauro Iodice, V. Papavassiliou, R. Van de Vyver, G. M. Urciuoli, C. A. Miller, J. Ely, J. Franz, E. Thomas, G. Schnell, N. Koch, S. Potashov, S. E. Williamson, H. Zohrabian, P. Carter, M. Kirsch, Adel Terkulov, Dirk Ryckbosch, David H. Potterveld, P. Di Nezza, Th. Benisch, B. Braun, Thomas O'Neill, F. Menden, K. P. Schüler, S. Rudnitsky, A. Metz, Nicola Bianchi, O. Mikloukho, A. R. Reolon, Kevin L. McIlhany, G. Rakness, P. Slavich, Jeffrey Brack, J. Stenger, and W. Haeberli
Subjects: Nuclear physics, Physics, Nuclear and High Energy Physics, Cross section.transverse, Deuterium, Bibliography, Deep inelastic scattering
Published: 2003

59. Publisher's Note: Exclusiveπ0electroproduction atW>2GeV with CLAS [Phys. Rev. C 90, 025205 (2014)]

Author: George Davey Smith, N. A. Baltzell, D. Doughty, M. Khandaker, A. Simonyan, J. P. Ball, A. D'Angelo, Y. Prok, D. S. Carman, I. Zonta, H. Moutarde, K. L. Giovanetti, Larry Weinstein, X. Wei, H. Y. Lu, E. De Sanctis, V. P. Kubarovsky, M. Contalbrigo, Sergey Kuleshov, L. El Fassi, O. Pogorelko, D. I. Sober, D. Protopopescu, M. Garçon, E. Voutier, A. Movsisyan, N. Dashyan, Y. G. Sharabian, S. Chandavar, Frank Klein, A. V. Vlassov, F. X. Girod, D. G. Ireland, Dustin Keller, K. Livingston, C. Munoz Camacho, R. De Vita, K. P. Adhikari, V. Crede, Andrew Puckett, Lorenzo Zana, Martin K. Mayer, K. Hafidi, R. Dupre, S. Anefalos Pereira, V. Sytnik, M. Battaglieri, P. L. Cole, Z. W. Zhao, H. Hakobyan, H. S. Jo, B. McKinnon, S. Strauch, W. Kim, S. Niccolai, H. Avakian, P. Nadel-Turonski, B. Guegan, R. A. Montgomery, M. Mirazita, I. Niculescu, M. Yurov, E. Phelps, Diane Schott, H. Voskanyan, N. Gevorgyan, S. Fegan, S. Koirala, A. I. Ostrovidov, K. Park, G. V. Fedotov, W. J. Briscoe, E. Pasyuk, P. Roy, C. Djalali, A. Celentano, R. W. Gothe, M. Ripani, Volker D. Burkert, M. Guidal, A. S. Biselli, D. P. Watts, H. Egiyan, Nicholas M. Harrison, A. El Alaoui, L. Colaneri, Gerard Gilfoyle, D. Sokhan, D. G. Jenkins, W. I. Levine, M. Holtrop, Nicholas Zachariou, N. Markov, R. A. Schumacher, S. E. Kuhn, M. Hattawy, S. Pisano, Luciano Pappalardo, O. Cortes, I. Bedlinskiy, J. A. Fleming, J. Bono, K. A. Griffioen, E. L. Isupov, N. K. Walford, Andreas Klein, J. J. Phillips, Ye Tian, S. Park, P. Eugenio, Carlos A. Salgado, S. Boiarinov, P. Rossi, W. Tang, Y. Ghandilyan, Barry Ritchie, B. S. Ishkhanov, M. Osipenko, T. A. Forest, S. Stepanyan, B. Garillon, S. Procureur, P. Stoler, A. Kim, E. Seder, K. Hicks, William Brooks, I. J. D. MacGregor, W. Phelps, G. Gavalian, V. Mokeev, I. Senderovich, Alessandro Rizzo, E. Golovatch, L. Elouadrhiri, A. Deur, J. Zhang, J. W. Price, L. Guo, M. Ungaro, K. Joo, V. Batourine, F. Sabatié, C. I. Moody, P. Lenisa, and Brian Raue
Subjects: Physics, Nuclear physics, Nuclear and High Energy Physics, Meson production
Published: 2014

60. Precision measurements ofg1of the proton and of the deuteron with 6 GeV electrons

Author: P. Lenisa, N. A. Baltzell, D. Meekins, E. De Sanctis, M. Aghasyan, C. Keith, D. I. Sober, Friedrich Klein, K. A. Griffioen, G. Rosner, M. Contalbrigo, L. Elouadrhiri, V. Crede, O. Pogorelko, Y. Ghandilyan, F. Sabatié, P. Roy, C. Smith, Diane Schott, Victor Mokeev, C. Hanretty, D. S. Carman, R. A. Montgomery, M. J. Amaryan, D. Adikaram, A. I. Ostrovidov, K. Park, K. Hicks, J. W. Price, S. Strauch, S. Fegan, H. S. Jo, H. Moutarde, S. Tkachenko, A. V. Vlassov, D. G. Ireland, G. D. Smith, S. Stepanyan, M. Holtrop, D. Protopopescu, K. Joo, W. Tang, A. Movsisyan, E. Voutier, T. Mineeva, K. L. Giovanetti, Larry Weinstein, B. Zhao, S. Pozdniakov, M. Garçon, Nicholas Kvaltine, R. A. Schumacher, I. Zonta, P. Bosted, N. Harrison, Volker D. Burkert, A. S. Biselli, S. Koirala, M. Osipenko, A. Kim, B. Guegan, S. S. Jawalkar, J. J. Phillips, R. De Vita, M. Ungaro, J. Brock, S. Anefalos Pereira, H. Voskanyan, Y. Prok, W. Gohn, S. Bültmann, K. Hafidi, Y. G. Sharabian, C. Carlin, R. G. Fersch, I. I. Strakovsky, S. S. Stepanyan, I. J. D. MacGregor, Andrew Puckett, T. A. Forest, V. Sytnik, P. L. Cole, B. Garillon, K. Livingston, Jie Zhang, Martin K. Mayer, R. W. Gothe, A. Deur, N. Kalantarians, Gerard Gilfoyle, J. Pierce, Avraham Klein, B. Vernarsky, Y. Ilieva, N. K. Walford, S. Chandavar, W. Kim, N. Guler, G. Niculescu, D. Sokhan, L. Colaneri, M. S. Saini, W. J. Briscoe, J. Bono, P. Nadel-Turonski, D. Doughty, Chaden Djalali, B. S. Ishkhanov, L. El Fassi, D. Keller, N. Markov, M. Taiuti, P. Rossi, S. Pisano, A. Simonyan, Sergey Kuleshov, R. Paremuzyan, G. E. Dodge, H. Y. Lu, M. Mirazita, P. Peng, H. Avakian, C. Munoz Camacho, A. El Alaoui, W. K. Brooks, F. X. Girod, Z. W. Zhao, D. P. Watts, I. Niculescu, B. McKinnon, N. Gevorgyan, D. Ho, J. P. Ball, M. Khandaker, Nicholas Zachariou, M. Ripani, L. L. Pappalardo, V. P. Kubarovsky, Andrea Celentano, S. E. Kuhn, A. Rizzo, D. Rimal, S. Procureur, J. A. Fleming, E. Munevar, Annalisa D'Angelo, S. Niccolai, D. G. Crabb, B. A. Raue, N. Dashyan, M. Battaglieri, H. Baghdasaryan, Lorenzo Zana, G. V. Fedotov, K. P. Adhikari, X. Jiang, E. Seder, M. Hattawy, C. Salgado, J. T. Goetz, O. Cortes, E. L. Isupov, R. Dupre, Département de Physique Nucléaire (ex SPhN) (DPHN), Institut de Recherches sur les lois Fondamentales de l'Univers (IRFU), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, Institut de Physique Nucléaire d'Orsay (IPNO), Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11), Laboratoire de Physique Subatomique et de Cosmologie (LPSC), Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Institut Polytechnique de Grenoble - Grenoble Institute of Technology-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Joseph Fourier - Grenoble 1 (UJF)-Centre National de la Recherche Scientifique (CNRS), CLAS, Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), and Université Joseph Fourier - Grenoble 1 (UJF)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Institut Polytechnique de Grenoble - Grenoble Institute of Technology-Centre National de la Recherche Scientifique (CNRS)
Subjects: Nuclear and High Energy Physics, Particle physics, FOS: Physical sciences, SPIN STRUCTURE, INELASTIC EP, SCATTERING, NUCLEON, CLAS, Electron, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 7. Clean energy, Settore FIS/04 - Fisica Nucleare e Subnucleare, NO, Nuclear physics, Invariant mass, Nuclear Experiment (nucl-ex), Nuclear Experiment, Quantum chromodynamics, Physics, Scattering, Polarization (waves), Deuterium, Quark–gluon plasma, High Energy Physics::Experiment, Nucleon
Abstract: The inclusive polarized structure functions of the proton and deuteron, g(1)(p) and g(1)(d) , were measured with high statistical precision using polarized 6 GeV electrons incident on a polarized ammonia target in Hall B at Jefferson Laboratory. Electrons scattered at laboratory angles between 18 and 45 degrees were detected using the CEBAF Large Acceptance Spectrometer (CLAS). For the usual deep inelastic region kinematics, Q(2) > 1 GeV2 and the final-state invariant mass W > 2 GeV, the ratio of polarized to unpolarized structure functions g(1)/F-1 is found to be nearly independent of Q(2) at fixed x. Significant resonant structure is apparent at values of W up to 2.3 GeV. In the framework of perturbative quantum chromodynamics, the high-W results can be used to better constrain the polarization of quarks and gluons in the nucleon, as well as high-twist contributions.
Published: 2014

61. Exclusiveπ0electroproduction atW>2 GeV with CLAS

Author: Latifa Elouadrhiri, P. Lenisa, J. P. Ball, Y. Prok, H. Moutarde, D. S. Carman, G. V. Fedotov, E. De Sanctis, K. L. Giovanetti, Larry Weinstein, C. Djalali, A. Movsisyan, Friedrich Klein, D. I. Sober, H. Hakobyan, K. P. Adhikari, W. Phelps, Brian Raue, D. Doughty, W. Tang, P. Roy, E. Voutier, M. Osipenko, V. Crede, P. Eugenio, A. V. Vlassov, E. Golovatch, B. Guegan, S. Fegan, R. A. Montgomery, K. Livingston, Y. Ghandilyan, F. Sabatié, J. Bono, B. S. Ishkhanov, R. De Vita, I. Bedlinskiy, H. Y. Lu, A. D'Angelo, C. I. Moody, G. D. Smith, M. Holtrop, S. E. Kuhn, N. Dashyan, B. Garillon, M. Hattawy, J. A. Fleming, Z. W. Zhao, Barry Ritchie, Luciano Pappalardo, I. Zonta, S. Anefalos Pereira, S. Chandavar, H. Avakian, L. El Fassi, P. Stoler, W. J. Briscoe, W. Kim, X. Wei, S. Procureur, Lorenzo Zana, I. Niculescu, I. Senderovich, K. Hicks, M. Khandaker, N. K. Walford, H. Voskanyan, A. Kim, P. Rossi, L. Guo, W. I. Levine, R. A. Schumacher, S. Strauch, S. Park, Y. G. Sharabian, E. Seder, D. P. Watts, S. Niccolai, H. S. Jo, D. Protopopescu, H. Egiyan, A. Deur, P. L. Cole, N. Harrison, Andrew Puckett, T. A. Forest, M. Garçon, W. K. Brooks, R. Dupre, Alessandro Rizzo, Martin K. Mayer, Avraham Klein, P. Nadel-Turonski, M. Battaglieri, Sergey Kuleshov, A. El Alaoui, J. J. Phillips, Nicholas Zachariou, G. Gavalian, Dustin Keller, M. Ripani, K. Hafidi, A. Simonyan, C. Salgado, I. J. D. MacGregor, M. Yurov, S. S. Stepanyan, V. P. Kubarovsky, O. Pogorelko, V. Sytnik, M. Contalbrigo, Gerard Gilfoyle, L. Colaneri, N. Markov, D. Sokhan, A. Celentano, R. W. Gothe, S. Pisano, O. Cortes, E. L. Isupov, Ye Tian, Diane Schott, S. Boiarinov, A. I. Ostrovidov, K. Park, D. G. Ireland, Volker D. Burkert, A. S. Biselli, C. Munoz Camacho, B. McKinnon, M. Mirazita, E. Phelps, N. Gevorgyan, V. Batourine, F. X. Girod, J. W. Price, S. Koirala, D. G. Jenkins, Eugene Pasyuk, N. A. Baltzell, K. A. Griffioen, Victor Mokeev, M. Ungaro, K. Joo, and J. Zhang
Subjects: Physics, Nuclear and High Energy Physics, Particle physics, Meson, Structure function, Magnitude (mathematics), Parton, Helicity, Nuclear physics, Transverse plane, Pi, High Energy Physics::Experiment, Vector meson, Nuclear Experiment
Abstract: Exclusive neutral-pion electroproduction (ep-->e'p'pi0) was measured at Jefferson Lab with a 5.75-GeV electron beam and the CLAS detector. Differential cross sections d4sigma/dtdQ2dxBdphipi and structure functions sigmaT+epsilonsigmaL,sigmaTT and σLT as functions of t were obtained over a wide range of Q2 and xB. The data are compared with Regge and handbag theoretical calculations. Analyses in both frameworks find that a large dominance of transverse processes is necessary to explain the experimental results. For the Regge analysis it is found that the inclusion of vector meson rescattering processes is necessary to bring the magnitude of the calculated and measured structure functions into rough agreement. In the handbag framework, there are two independent calculations, both of which appear to roughly explain the magnitude of the structure functions in terms of transversity generalized parton distributions.
Published: 2014

62. Induced polarization of {\Lambda}(1116) in kaon electroproduction

Author: B. S. Ishkhanov, A. Simonyan, W. Phelps, H. Hakobyan, H. S. Jo, C. A. Meyer, G. V. Fedotov, K. P. Adhikari, S. Strauch, P. Eugenio, S. E. Kuhn, M. Hattawy, J. A. Fleming, C. Salgado, F. X. Girod, V. P. Kubarovsky, Eugene Pasyuk, J. Bono, I. Bedlinskiy, P. Nadel-Turonski, N. Dashyan, S. Chandavar, O. Pogorelko, S. M. Hughes, F. Sabatié, M. J. Amaryan, S. Procureur, William Brooks, I. Zonta, X. Wei, H. Avakian, V. Baturin, Sergey Kuleshov, J. W. Price, N. K. Walford, B. Garillon, L. Zana, H. Voskanyan, H. Moutarde, R. Dupre, I. I. Strakovsky, M. Battaglieri, D. Ho, D. P. Watts, W. J. Briscoe, A. Deur, Yordanka Ilieva, S. Koirala, S. Niccolai, K. L. Giovanetti, S. S. Stepanyan, V. Sytnik, C. Djalali, Larry Weinstein, K. A. Griffioen, Alessandro Rizzo, Y. Ghandilyan, C. I. Moody, G. Charles, E. Golovatch, Dustin Keller, W. I. Levine, D. Adikaram, M. Guidal, G. Niculescu, D. G. Jenkins, R. A. Schumacher, G. D. Smith, M. Holtrop, M. Y. Gabrielyan, K. Hafidi, Luciano Pappalardo, M. Khandaker, J. P. Ball, T. A. Forest, D. S. Carman, M. Ripani, S. Stepanyan, E. Voutier, A. Movsisyan, E. Munevar, S. Fegan, V. Crede, A. V. Vlassov, R. De Vita, S. Anefalos Pereira, W. Tang, E. De Sanctis, M. Osipenko, D. I. Sober, W. Kim, Victor Mokeev, M. Ungaro, K. Joo, L. Guo, M. D. Mestayer, O. Cortes, Martin K. Mayer, S. Boiarinov, J. T. Goetz, K. Hicks, P. Lenisa, D. Doughty, Friedrich Klein, Brian Raue, A. D'Angelo, K. Livingston, L. El Fassi, R. Paremuzyan, Gerard Gilfoyle, J. J. Phillips, Jie Zhang, T. Cao, I. J. D. MacGregor, D. Sokhan, M. Contalbrigo, B. McKinnon, A. Celentano, R. W. Gothe, P. L. Cole, M. Mirazita, N. Gevorgyan, D. Protopopescu, S. Pozdniakov, P. Peng, C. Munoz Camacho, Diane Schott, N. A. Baltzell, K. Park, D. G. Ireland, H. Jiang, Volker D. Burkert, A. S. Biselli, Nicholas Zachariou, L. Colaneri, D. Rimal, S. Pisano, Département de Physique Nucléaire (ex SPhN) (DPHN), Institut de Recherches sur les lois Fondamentales de l'Univers (IRFU), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, Institut de Physique Nucléaire d'Orsay (IPNO), Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11), Laboratoire de Physique Subatomique et de Cosmologie (LPSC), Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Institut Polytechnique de Grenoble - Grenoble Institute of Technology-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Joseph Fourier - Grenoble 1 (UJF)-Centre National de la Recherche Scientifique (CNRS), CLAS, Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), and Université Joseph Fourier - Grenoble 1 (UJF)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Institut Polytechnique de Grenoble - Grenoble Institute of Technology-Centre National de la Recherche Scientifique (CNRS)
Subjects: Quark, Nuclear and High Energy Physics, Particle physics, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 01 natural sciences, Induced polarization, DECAYS, Settore FIS/04 - Fisica Nucleare e Subnucleare, NO, Nuclear physics, CLAS, 0103 physical sciences, GAMMA-P, SIGMA(0), 010306 general physics, NUCLEON, Nuclear Experiment, PHOTON ENERGIES, PHOTOPRODUCTION, K+LAMBDA, SYSTEM, Physics, Spectrometer, 010308 nuclear & particles physics, Momentum transfer, Hyperon, Interaction model, Cathode ray, High Energy Physics::Experiment, Nucleon
Abstract: We have measured the induced polarization of the ${\Lambda}(1116)$ in the reaction $ep\rightarrow e'K^+{\Lambda}$, detecting the scattered $e'$ and $K^+$ in the final state along with the proton from the decay $\Lambda\rightarrow p\pi^-$.The present study used the CEBAF Large Acceptance Spectrometer (CLAS), which allowed for a large kinematic acceptance in invariant energy $W$ ($1.6\leq W \leq 2.7$ GeV) and covered the full range of the kaon production angle at an average momentum transfer $Q^2=1.90$ GeV$^2$.In this experiment a 5.50 GeV electron beam was incident upon an unpolarized liquid-hydrogen target. We have mapped out the $W$ and kaon production angle dependencies of the induced polarization and found striking differences from photoproduction data over most of the kinematic range studied. However, we also found that the induced polarization is essentially $Q^2$ independent in our kinematic domain, suggesting that somewhere below the $Q^2$ covered here there must be a strong $Q^2$ dependence. Along with previously published photo- and electroproduction cross sections and polarization observables, these data are needed for the development of models, such as effective field theories, and as input to coupled-channel analyses that can provide evidence of previously unobserved $s$-channel resonances., Comment: 13 figures
Published: 2014

63. Measurement of the structure function of the nearly free neutron using spectator tagging in inelasticH2(e,e′ps)Xscattering with CLAS

Author: W. Kim, G. Niculescu, P. Lenisa, P. Nadel-Turonski, F. X. Girod, I. Zonta, X. Wei, B. McKinnon, A. Kim, S. Koirala, N. Dashyan, S. E. Kuhn, J. A. Fleming, M. Hattawy, B. S. Ishkhanov, Friedrich Klein, M. Mirazita, R. A. Schumacher, M. J. Amaryan, D. Dutta, N. A. Baltzell, J. Arrington, C. Djalali, S. Chandavar, Andrew Puckett, Martin K. Mayer, N. Gevorgyan, J. Zhang, L. Zana, V. Mokeev, K. A. Griffioen, H. Hakobyan, C. Hanretty, A. V. Vlassov, M. MacCormick, P. Eugenio, R. Paremuzyan, S. Bültmann, A. Simonyan, Latifa Elouadrhiri, G. Charles, S. Tkachenko, C. E. Hyde, K. L. Giovanetti, M. Ungaro, Larry Weinstein, M. Ripani, W. K. Brooks, R. Ent, I. Bedlinskiy, Gerard Gilfoyle, B. Garillon, D. Sokhan, Sergey Kuleshov, S. Stepanyan, Avraham Klein, G. V. Fedotov, V. P. Kubarovsky, K. P. Adhikari, D. Ho, Diane Schott, W. Tang, P. Roy, M. Osipenko, O. Pogorelko, Andrea Celentano, R. De Vita, S. Strauch, D. P. Watts, P. L. Cole, C. E. Keppel, D. Doughty, M. Guidal, D. G. Ireland, George Davey Smith, K. Park, V. Crede, M. Ispiryan, I. J. D. MacGregor, S. Lewis, H. Avakian, G. Rosner, R. A. Montgomery, R. Dupre, M. Battaglieri, C. Munoz Camacho, J. P. Ball, M. Holtrop, N. K. Walford, D. S. Carman, H. Voskanyan, M. Khandaker, Y. Ghandilyan, Volker D. Burkert, A. S. Biselli, S. Anefalos Pereira, Eugene Pasyuk, E. Seder, H. S. Jo, W. J. Briscoe, S. Niccolai, A. D'Angelo, Luciano Pappalardo, G. E. Dodge, H. Y. Lu, N. Markov, Dustin Keller, E. De Sanctis, S. S. Stepanyan, S. Pisano, M. Aghasyan, Michael Wood, K. Hafidi, D. I. Sober, I. Niculescu, L. El Fassi, K. Hicks, H. Egiyan, T. Mineeva, P. Bosted, M. E. Christy, L. Guo, I. Senderovich, Alessandro Rizzo, J. T. Goetz, O. Cortes, N. Harrison, H. Fenker, P. M. King, E. Golovatch, N. Baillie, A. Deur, N. Kalantarians, J. W. Price, D. Protopopescu, S. Pozdniakov, E. Voutier, K. Livingston, Y. G. Sharabian, F. Sabatié, P. Rossi, A. El Alaoui, Y. Ilieva, D. Rimal, M. Contalbrigo, W. Melnitchouk, V. Tvaskis, S. Procureur, R. W. Gothe, H. Moutarde, and J. J. Phillips
Subjects: Nuclear physics, Physics, Nuclear and High Energy Physics, Proton, Dynamic structure factor, Nuclear Theory, EMC effect, Momentum transfer, Neutron, Nuclear Experiment, Nucleon, Inelastic neutron scattering, Neutron time-of-flight scattering
Abstract: Background: Much less is known about neutron structure than that of the proton due to the absence of free neutron targets. Neutron information is usually extracted from data on nuclear targets such as deuterium, requiring corrections for nuclear binding and nucleon off-shell effects. These corrections are model dependent and have significant uncertainties, especially for large values of the Bjorken scaling variable x . As a consequence, the same data can lead to different conclusions, for example, about the behavior of the d quark distribution in the proton at large x . Purpose: The Barely Off-shell Nucleon Structure experiment at Jefferson Lab measured the inelastic electron-deuteron scattering cross section, tagging spectator protons in coincidence with the scattered electrons. This method reduces nuclear binding uncertainties significantly and has allowed for the first time a (nearly) model-independent extraction of the neutron structure function F 2 ( x , Q 2 ) in the resonance and deep-inelastic regions. Method: A novel compact radial time projection chamber was built to detect protons with momentum between 70 and 150 MeV / c and over a nearly 4 π angular range. For the extraction of the free-neutron structure function F 2 n , spectator protons at backward angles ( > 100 ∘ relative to the momentum transfer) and with momenta below 100 MeV / c were selected, ensuring that the scattering took place on a nearly free neutron. The scattered electrons were detected with Jefferson Lab's CLAS spectrometer, with data taken at beam energies near 2, 4, and 5 GeV. Results: The extracted neutron structure function F 2 n and its ratio to the inclusive deuteron structure function F 2 d are presented in both the resonance and the deep-inelastic regions for momentum transfer squared Q 2 between 0.7 and 5 GeV 2 / c 2 , invariant mass W between 1 and 2.7 GeV / c 2 , and Bjorken x between 0.25 and 0.6 (in the deep-inelastic scattering region). The dependence of the semi-inclusive cross section on the spectator proton momentum and angle is investigated, and tests of the spectator mechanism for different kinematics are performed. Conclusions: Our data set on the structure function ratio F 2 n / F 2 d can be used to study neutron resonance excitations, test quark-hadron duality in the neutron, develop more precise parametrizations of structure functions, and investigate binding effects (including possible mechanisms for the nuclear EMC effect) and provide a first glimpse of the asymptotic behavior of d / u at x → 1 .
Published: 2014

64. The CLAS Electromagnetic Calorimeter at Large Angles

Author: Paolo Rossi, H. Avakian, Marco Ripani, V. Sapunenko, Victor Mokeev, R. De Vita, P. Corvisiero, M. Battaglieri, E. Polli, M. Mirazita, M. Taiuti, F. Ronchetti, V. Muccifora, V. Gyuriyan, M. Anghinolfi, N. Bianchi, M. Osipenko, E. Golovach, and Giovanni Ricco
Subjects: Physics, Nuclear and High Energy Physics, Spectrometer, Physics::Instrumentation and Detectors, Monte Carlo method, Detector, Astrophysics::Instrumentation and Methods for Astrophysics, FOS: Physical sciences, Scintillator, Calorimeter, Nuclear physics, Electromagnetic calorimeter, Calibration, High Energy Physics::Experiment, Nuclear Experiment (nucl-ex), Instrumentation, Nuclear Experiment, Energy (signal processing)
Abstract: The study of the response of the two modules of the large-angle electromagnetic shower calorimeter (LAC) of the CLAS detector to charged and neutral particles is reported. The results agree very well with the Monte Carlo simulation. The procedures adopted for the energy and timing calibration are also discussed, proving that the module geometry allows for simple self-calibrating energy and timing algorithms.
Published: 2014

65. Publisher's Note: Beam asymmetryΣforπ+andπ0photoproduction on the proton for photon energies from 1.102 to 1.862 GeV [Phys. Rev. C88, 065203 (2013)]

Author: L. Elouadrhiri, N. A. Baltzell, I. I. Strakovsky, C. S. Nepali, George Davey Smith, A. Deur, M. Contalbrigo, R. Paremuzyan, S. Fegan, D. Adikaram, M. Guidal, F. X. Girod, E. De Sanctis, A. D'Angelo, V. Mokeev, G. Niculescu, M. Khandaker, W. Tang, M. Aghasyan, M. Osipenko, Nicholas M. Harrison, Gerard Gilfoyle, M. Holtrop, D. I. Sober, A. El Alaoui, Nicholas Zachariou, L. El Fassi, D. Martinez, I. J. D. MacGregor, S. Park, D. Sokhan, S. Strauch, N. Dashyan, Luciano Pappalardo, P. Nadel-Turonski, P. Rossi, D. Rimal, I. Zonta, C. Djalali, A. Celentano, R. W. Gothe, D. P. Watts, W. Gohn, H. Y. Lu, S. Koirala, H. Egiyan, M. J. Amaryan, K. Livingston, Frank Klein, D. G. Ireland, Dustin Keller, Yordanka Ilieva, Diane Schott, E. Munevar, A. I. Ostrovidov, K. Park, R. De Vita, B. S. Ishkhanov, Michael Dugger, Sergey Kuleshov, Yakov I. Azimov, Brian Raue, H. Moutarde, V. Crede, E. Golovatch, A. Kubarovsky, K. A. Griffioen, N. K. Walford, I. Niculescu, N. Guler, K. L. Giovanetti, J. J. Phillips, K. Hafidi, S. Anefalos Pereira, R. A. Montgomery, P. Stoler, Ron L. Workman, V. Batourine, D. Doughty, G. Rosner, P. L. Cole, Z. W. Zhao, Volker D. Burkert, A. S. Biselli, R. A. Schumacher, S. Niccolai, D. Heddle, J. P. Ball, Y. Prok, D. S. Carman, F. Sabatié, K. Hicks, C. Hanretty, J. Zhang, S. Chandavar, S. Tkachenko, T. Mineeva, D. Protopopescu, J. W. Price, H. Avakian, P. Peng, B. Torayev, S. Pozdniakov, I. Senderovich, Alessandro Rizzo, E. Voutier, L. Guo, M. Ungaro, C. Munoz Camacho, S. Stepanyan, I. Bedlinskiy, Andreas Klein, M. Ripani, A. Kim, B. McKinnon, H. Voskanyan, K. Joo, Carlos A. Salgado, M. Mirazita, E. Phelps, W. J. Briscoe, E. Pasyuk, N. Gevorgyan, S. Procureur, S. Pisano, R. Dupre, M. Battaglieri, J. A. Fleming, V. P. Kubarovsky, P. Collins, O. Pogorelko, S. Lewis, Martin K. Mayer, M. S. Saini, J. T. Goetz, H. Seraydaryan, Y. G. Sharabian, P. Eugenio, M. Taiuti, D. Ho, E. Seder, Barry Ritchie, O. Cortes, E. L. Isupov, Ye Tian, S. Boiarinov, G. V. Fedotov, D. P. Weygand, K. P. Adhikari, Lorenzo Zana, H. Hakobyan, H. S. Jo, and W. Kim
Subjects: Nuclear physics, Physics, Nuclear and High Energy Physics, Particle physics, Meson production, Photon, Proton, Partial wave analysis, media_common.quotation_subject, Asymmetry, Beam (structure), media_common
Published: 2014

66. Momentum sharing in imbalanced Fermi systems

Author: W. Kim, G. Niculescu, S. Chandavar, J. T. Goetz, A. Kim, P. Lenisa, C. E. Hyde, I. Niculescu, N. A. Baltzell, H. Hakobyan, Friedrich Klein, J. Ball, D. Doughty, C. Hanretty, D. Rimal, Shalev Gilad, F. Sabatié, A. El Alaoui, R. Dupre, M. Battaglieri, S. Fegan, Chaden Djalali, S. May-Tal Beck, P. Stoler, Nicholas Zachariou, Michael Dugger, M. Ripani, John Arrington, T. Cao, William Brooks, A. Deur, J. W. Price, M. Lowry, I. J. D. MacGregor, G. Rosner, H. Y. Lu, O. Pogorelko, Diane Schott, R. Shneor, I. Bedlinskiy, K. Park, S. Koirala, Y. Ilieva, Latifa Elouadrhiri, E. L. Isupov, M. Ungaro, D. G. Ireland, R. A. Schumacher, D. Protopopescu, N. Markov, H. Jiang, Volker D. Burkert, Y. Ghandilyan, A. S. Biselli, R. De Vita, L. L. Pappalardo, I. Zonta, G. V. Fedotov, X. Wei, S. Strauch, Douglas Higinbotham, L. Colaneri, M. Osipenko, A. Beck, K. Livingston, L. El Fassi, Lorenzo Zana, T. A. Forest, S. Stepanyan, Misak Sargsian, Hovanes Egiyan, C. Munoz Camacho, S. Pisano, K. P. Adhikari, M. Taiuti, M. Braverman, R. Paremuzyan, K. A. Griffioen, M. Mayer, Larry Weinstein, William Bertozzi, D. Keller, T. Mineeva, D. S. Carman, Andrea Celentano, Barry Ritchie, Gerard Gilfoyle, K. Joo, Eli Piasetzky, S. E. Kuhn, D. Sokhan, M. Hattawy, P. L. Cole, M. Khandaker, P. Rossi, R. W. Gothe, F. X. Girod, B. Garillon, V. Crede, B. McKinnon, S. A. Wood, Z. W. Zhao, N. Gevorgyan, P. Nadel-Turonski, M. Garçon, W. I. Levine, Victor Mokeev, E. Voutier, Y. G. Sharabian, X. Zheng, Andrew Puckett, H. S. Jo, A. V. Vlassov, S. Tkachenko, L. Guo, G. Asryan, K. Hicks, Y. Prok, W. Phelps, A. Rizzo, S. Niccolai, A. Movsisyan, S. S. Stepanyan, E. Pasyuk, V. Sytnik, Or Hen, I. Korover, P. Roy, M. Guidal, B. Mustapha, B. I. Ishkanov, G. D. Smith, M. Holtrop, S. Procureur, V. P. Kubarovsky, Annalisa D'Angelo, Michael Wood, K. Hafidi, H. Avakian, N. K. Walford, Département de Physique Nucléaire (ex SPhN) (DPHN), Institut de Recherches sur les lois Fondamentales de l'Univers (IRFU), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, Laboratoire de Physique Subatomique et de Cosmologie (LPSC), Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Institut Polytechnique de Grenoble - Grenoble Institute of Technology-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Joseph Fourier - Grenoble 1 (UJF)-Centre National de la Recherche Scientifique (CNRS), Institut de Physique Nucléaire d'Orsay (IPNO), Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11), CLAS Collaboration, Université Joseph Fourier - Grenoble 1 (UJF)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Institut Polytechnique de Grenoble - Grenoble Institute of Technology-Centre National de la Recherche Scientifique (CNRS), and Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)
Subjects: Nuclear Theory, Astrophysics::High Energy Astrophysical Phenomena, FOS: Physical sciences, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 7. Clean energy, Settore FIS/04 - Fisica Nucleare e Subnucleare, Nuclear physics, Nuclear Theory (nucl-th), symbols.namesake, Pauli exclusion principle, Semi-empirical mass formula, Nuclear force, Nuclear drip line, Nuclear Experiment (nucl-ex), Nuclear Experiment, Condensed Matter::Quantum Gases, Physics, Multidisciplinary, Fermi energy, Quantum Gases (cond-mat.quant-gas), Atomic nucleus, Nuclear magnetic moment, symbols, Condensed Matter - Quantum Gases, Fermi gas
Abstract: The atomic nucleus is composed of two different kinds of fermions, protons and neutrons. If the protons and neutrons did not interact, the Pauli exclusion principle would force the majority fermions (usually neutrons) to have a higher average momentum. Our high-energy electron scattering measurements using 12C, 27Al, 56Fe and 208Pb targets show that, even in heavy neutron-rich nuclei, short-range interactions between the fermions form correlated high-momentum neutron-proton pairs. Thus, in neutron-rich nuclei, protons have a greater probability than neutrons to have momentum greater than the Fermi momentum. This finding has implications ranging from nuclear few body systems to neutron stars and may also be observable experimentally in two-spin state, ultra-cold atomic gas systems., Comment: Published in Science. 10 pages, 3 figures
Published: 2014

67. Exclusive π0 electroproduction at W>2 GeV with CLAS

Author: I. BedlinskiyInstitute of Theoretical and Experimental Physics, V. Kubarovsky(Thomas Jefferson National Accelerator Facility), S. Niccolai(Institut de Physique Nucléaire ORSAY), P. Stoler(Rensselaer Polytechnic Institute), K. P. Adhikari(Old Dominion University), M. D. Anderson(University of Glasgow), S. Anefalos Pereira(INFN), H. Avakian(Thomas Jefferson National Accelerator Facility), J. Ball(CEA), N. A. Baltzell(Argonne National Laboratory), M. Battaglieri(INFN), V. Batourine(Thomas Jefferson National Accelerator Facility), A. S. Biselli(Thomas Jefferson National Accelerator Facility), S. Boiarinov(Thomas Jefferson National Accelerator Facility), J. Bono(Florida International University), W. J. Briscoe(The George Washington University), W. K. Brooks(Universidad Técnica Federico Santa María), V. D. Burkert(Thomas Jefferson National Accelerator Facility), D. S. Carman(Thomas Jefferson National Accelerator Facility), A. Celentano(INFN), S. Chandavar(Ohio University), L. Colaneri(INFN), P. L. Cole(Idaho State University), M. Contalbrigo(INFN), O. Cortes(Idaho State University), V. Crede(Florida State University), A. D'Angelo(INFN), N. Dashyan(Yerevan Physics Institute), R. De Vita(INFN), E. De Sanctis(INFN), A. Deur(Thomas Jefferson National Accelerator Facility), C. Djalali(University of South Carolina), D. Doughty(Christopher Newport University), R. Dupre(Institut de Physique Nucléaire ORSAY), H. Egiyan(Thomas Jefferson National Accelerator Facility), A. El Alaoui(Argonne National Laboratory), L. El Fassi(Old Dominion University), L. Elouadrhiri(Thomas Jefferson National Accelerator Facility), P. Eugenio(Florida State University), G. Fedotov(University of South Carolina), S. Fegan(INFN), J. A. Fleming(Edinburgh University), T. A. Forest(Idaho State University), B. Garillon(Institut de Physique Nucléaire ORSAY), M. Gar\c con(CEA), G. Gavalian(Old Dominion University), N. Gevorgyan(Yerevan Physics Institute), Y. Ghandilyan(Yerevan Physics Institute), G. P. Gilfoyle(University of Richmond), K. L. Giovanetti(James Madison University), F. X. Girod(Thomas Jefferson National Accelerator Facility), E. Golovatch(Skobeltsyn Institute of Nuclear Physics), R. W. Gothe(University of South Carolina), K. A. Griffioen(Institut de Physique Nucléaire ORSAY), B. Guegan(Institut de Physique Nucléaire ORSAY), L. Guo(Florida International University), K. Hafidi(Argonne National Laboratory), H. Hakobyan(Universidad Técnica Federico Santa María), N. Harrison(University of Connecticut), M. Hattawy(Institut de Physique Nucléaire ORSAY), K. Hicks(Ohio University), M. Holtrop(University of New Hampshire), D. G. Ireland(University of Glasgow), B. S. Ishkhanov(Skobeltsyn Institute of Nuclear Physics), E. L. Isupov(Skobeltsyn Institute of Nuclear Physics), D. Jenkins(Institut de Physique Nucléaire ORSAY), H. S. Jo(Institut de Physique Nucléaire ORSAY), K. Joo(University of Connecticut), D. Keller(University of Virginia), M. Khandaker(Idaho State University), A. Kim(University of Connecticut), W. Kim(Kyungpook National University), A. Klein(Old Dominion University), F. J. Klein(Catholic University of America), S. Koirala(Old Dominion University), S. E. Kuhn(Old Dominion University), S. V. Kuleshov(Universidad Técnica Federico Santa María), P. Lenisa(INFN), W. I. Levine(Carnegie Mellon University), K. Livingston(University of Glasgow), H. Y. Lu(University of South Carolina), I . J . D. MacGregor(University of Glasgow), N. Markov(University of Connecticut), M. Mayer(Old Dominion University), B. McKinnon(University of Glasgow), M. Mirazita(INFN), V. Mokeev(Thomas Jefferson National Accelerator Facility), R. A. Montgomery(INFN), C. I. Moody(Argonne National Laboratory), H. Moutarde(CEA), A Movsisyan(INFN), C. Munoz Camacho(Institut de Physique Nucléaire ORSAY), P. Nadel-Turonski(Thomas Jefferson National Accelerator Facility), I. Niculescu(James Madison University), M. Osipenko(INFN), A. I. Ostrovidov(Florida State University), L. L. Pappalardo(INFN), K. Park(Thomas Jefferson National Accelerator Facility), S. Park(Florida State University), E. Pasyuk(Thomas Jefferson National Accelerator Facility), E. Phelps(University of South Carolina), W. Phelps(Florida International University), J. J. Phillips(University of Glasgow), S. Pisano(INFN), O. Pogorelko(Institute of Theoretical and Experimental Physics), J. W. Price(California State University), Y. Prok(Old Dominion University), D. Protopopescu(University of Glasgow), S. Procureur(CEA), A. J. R. Puckett(University of Connecticut), B. A. Raue(Florida International University), M. Ripani(INFN), B. G. Ritchie(Arizona State University), A. Rizzo(INFN), P. Rossi(INFN), P. Roy(Florida State University), F. Sabatié(CEA), C. Salgado(Norfolk State University), D. Schott(The George Washington University), R. A. Schumacher(Carnegie Mellon University), E. Seder(University of Connecticut), I. Senderovich(Arizona State University), Y. G. Sharabian(Thomas Jefferson National Accelerator Facility), A. Simonyan(Yerevan Physics Institute), G. D. Smith(Edinburgh University), D. I. Sober(Catholic University of America), D. Sokhan(University of Glasgow), S. S. Stepanyan(Kyungpook National University), S. Strauch(University of South Carolina), V. Sytnik(Universidad Técnica Federico Santa María), W. Tang(Ohio University), Ye Tian(University of South Carolina), M. Ungaro(Thomas Jefferson National Accelerator Facility), A. V. Vlassov(Institute of Theoretical and Experimental Physics), H. Voskanyan(Yerevan Physics Institute), E. Voutier(LPSC), N. K. Walford(Catholic University of America), D. Watts(University of Glasgow), X. Wei(Thomas Jefferson National Accelerator Facility), L. B. Weinstein(Old Dominion University), M. Yurov(University of Virginia), N. Zachariou(University of South Carolina), L. Zana(Edinburgh University), J. Zhang(Thomas Jefferson National Accelerator Facility), Z. W. Zhao(University of Virginia), I. Zonta(INFN), and for the CLAS Collaboration()
Subjects: hep-ex, High Energy Physics::Experiment, Nuclear Experiment, nucl-ex, NO
Abstract: Exclusive neutral-pion electroproduction ($ep\to e^\prime p^\prime \pi^0$) was measured at Jefferson Lab with a 5.75-GeV electron beam and the CLAS detector. Differential cross sections $d^4\sigma/dtdQ^2dx_Bd\phi_\pi$ and structure functions $\sigma_T+\epsilon\sigma_L, \sigma_{TT}$ and $\sigma_{LT}$ as functions of $t$ were obtained over a wide range of $Q^2$ and $x_B$. The data are compared with Regge and handbag theoretical calculations. Analyses in both frameworks find that a large dominance of transverse processes is necessary to explain the experimental results. For the Regge analysis it is found that the inclusion of vector meson rescattering processes is necessary to bring the magnitude of the calculated and measured structure functions into rough agreement. In the handbag framework, there are two independent calculations, both of which appear to roughly explain the magnitude of the structure functions in terms of transversity generalized parton distributions.
Published: 2014

68. $\phi$-meson photoproduction on Hydrogen in the neutral decay mode

Author: D. Doughty, Michael Wood, D. Heddle, K. Livingston, K. Hafidi, Jie Zhang, W. Kim, Victor Mokeev, N. Guler, Y. Ilieva, R. De Vita, W. J. Briscoe, P. Rossi, H. Y. Lu, M. J. Amaryan, S. Lewis, D. S. Carman, E. Munevar, N. A. Baltzell, H. Moutarde, P. Eugenio, E. Seder, N. Dashyan, M. Ungaro, K. L. Giovanetti, C. E. Hyde, K. A. Griffioen, Larry Weinstein, J. Bono, P. Nadel-Turonski, D. Protopopescu, W. Gohn, S. Pozdniakov, I. Niculescu, B. S. Ishkhanov, D. Keller, A. Kim, F. X. Girod, Z. W. Zhao, D. Ho, L. Weinstein, V. P. Kubarovsky, K. Joo, Barry Ritchie, P. Stoler, I. I. Strakovsky, Annalisa D'Angelo, H. Hakobyan, C. Hanretty, Andrea Celentano, R. Paremuzyan, M. Khandaker, A. Deur, K. Hicks, Nicholas Zachariou, H. Avakian, M. Ripani, W. Tang, S. E. Kuhn, W. K. Brooks, D. P. Watts, J. A. Fleming, J. J. Phillips, D. Rimal, M. Osipenko, C. E. Taylor, H. Baghdasaryan, S. Tkachenko, L. Guo, N. K. Walford, G. V. Fedotov, H. Voskanyan, G. Rosner, R. Nasseripour, I. J. D. MacGregor, E. Pasyuk, K. P. Adhikari, E. Golovatch, E. Voutier, Andrew Puckett, Martin K. Mayer, S. Strauch, D. Martinez, R. P. Bennett, E. De Sanctis, N. Harrison, R. G. Fersch, S. Fegan, M. Aghasyan, D. Adikaram, M. Guidal, Friedrich Klein, M. S. Saini, I. Bedlinskiy, R. A. Schumacher, D. I. Sober, G. D. Smith, M. Holtrop, D. Sokhan, J. P. Ball, S. Chandavar, Luciano Pappalardo, A. Rizzo, S. Park, R. W. Gothe, R. Dupre, M. Battaglieri, S. Niccolai, T. Mineeva, O. Pogorelko, P. Collins, M. F. Vineyard, Diane Schott, L. El Fassi, S. Bültmann, Sergey Kuleshov, A. I. Ostrovidov, K. Park, H. Seraydaryan, S. Anefalos Pereira, Y. G. Sharabian, A. Kubarovsky, S. Stepanyan, D. G. Ireland, V. Crede, Volker D. Burkert, M. Contalbrigo, A. S. Biselli, R. A. Montgomery, J. T. Goetz, H. S. Jo, S. Pisano, C. Munoz Camacho, Lorenzo Zana, B. McKinnon, M. Mirazita, C. Salgado, E. Phelps, N. Gevorgyan, V. Batourine, O. Cortes, E. L. Isupov, Ye Tian, S. Boiarinov, F. Sabatié, J. W. Price, G. Gavalian, S. Koirala, Chaden Djalali, Michael Dugger, Old Dominion University [Norfolk] (ODU), Laboratoire de Physique Subatomique et de Cosmologie (LPSC), Université Joseph Fourier - Grenoble 1 (UJF)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Institut Polytechnique de Grenoble - Grenoble Institute of Technology-Centre National de la Recherche Scientifique (CNRS), Département de Physique Nucléaire (ex SPhN) (DPHN), Institut de Recherches sur les lois Fondamentales de l'Univers (IRFU), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, CLAS, and Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Institut Polytechnique de Grenoble - Grenoble Institute of Technology-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Joseph Fourier - Grenoble 1 (UJF)-Centre National de la Recherche Scientifique (CNRS)
Subjects: Nuclear and High Energy Physics, Particle physics, Meson, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], Settore FIS/04 - Fisica Nucleare e Subnucleare, High Energy Physics - Experiment, Nuclear physics, Pion, LARGE MOMENTUM-TRANSFER, DRIFT CHAMBER SYSTEM, CLAS, [PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex], PERTURBATIVE QCD, SPECTROMETER, Invariant mass, NEAR-THRESHOLD, Nuclear Experiment, DETECTOR, Physics, Spectrometer, Perturbative QCD, Phi meson, Baryon, BARYON RESONANCES, High Energy Physics::Experiment, Energy (signal processing)
Abstract: See paper for full list of authors; We report the first measurement of the photoproduction cross section of the $\phi$ meson in its neutral decay mode in the reaction $\gamma p \to p\phi(K_SK_L)$. The experiment was performed with a tagged photon beam of energy $1.6 \le E_\gamma \le 3.6$ GeV incident on a liquid hydrogen target of the CLAS spectrometer at the Thomas Jefferson National Accelerator Facility. The $p \phi$ final state is identified via reconstruction of $K_S$ in the invariant mass of two oppositely charged pions and by requiring the missing particle in the reaction $\gamma p \to p K_S X$ to be $K_L$. The presented results significantly enlarge the existing data on $\phi$-photoproduction. These data, combined with the data from the charged decay mode, will help to constrain different mechanisms of $\phi$ photoproduction.
Published: 2014

69. Beam-spin Asymmetries from Semi-inclusive Pion Electroproduction

Author: P. Lenisa, R. Dupre, J. Bono, P. Nadel-Turonski, M. Battaglieri, I. Zonta, G. V. Fedotov, V. Crede, Friedrich Klein, C. Hanretty, S. Niccolai, H. Avakian, S. Strauch, Brian Raue, F. X. Girod, R. Paremuzyan, K. P. Adhikari, B. S. Ishkhanov, P. Eugenio, N. K. Walford, M. Ungaro, H. Voskanyan, George Davey Smith, S. Chandavar, C. E. Hyde, H. Y. Lu, W. Kim, E. Pasyuk, W. J. Briscoe, G. Charles, P. Khetarpal, I. I. Strakovsky, S. Pisano, Gerard Gilfoyle, S. Procureur, C. Djalali, I. Niculescu, K. Joo, F. Sabatié, H. Seraydaryan, D. Sokhan, E. Seder, J. J. Phillips, Y. G. Sharabian, D. Ho, B. Vernarsky, D. S. Carman, Y. Prok, Dustin Keller, N. A. Baltzell, A. D'Angelo, L. El Fassi, O. Cortes, B. McKinnon, A. Movsisyan, M. Garçon, I. J. D. MacGregor, W. K. Brooks, E. Voutier, P. Roy, Barry Ritchie, M. Contalbrigo, L. Zana, G. Rosner, J. W. Price, Victor Mokeev, J. Ball, Michael Wood, W. Tang, D. P. Watts, K. Hafidi, T. Mineeva, Y. Ghandilyan, H. S. Jo, E. De Sanctis, B. Guegan, M. Mirazita, M. Holtrop, M. Osipenko, R. A. Schumacher, Diane Schott, A. I. Ostrovidov, M. Aghasyan, Luciano Pappalardo, K. Park, A. Simonyan, S. Koirala, D. G. Ireland, D. I. Sober, S. E. Kuhn, T. A. Forest, N. Markov, Volker D. Burkert, A. S. Biselli, S. Stepanyan, J. A. Fleming, Sergey Kuleshov, A. Celentano, R. De Vita, R. W. Gothe, V. P. Kubarovsky, Mohammad Hattawy, S. Anefalos Pereira, N. Dashyan, P. L. Cole, P. Peng, K. A. Griffioen, Andrew Puckett, Martin K. Mayer, W. Gohn, P. Stoler, K. Hicks, S. Tkachenko, L. Guo, Alessandro Rizzo, N. Harrison, K. Livingston, Jie Zhang, P. Rossi, S. Pozdniakov, A. El Alaoui, Y. Ilieva, Nicholas Zachariou, M. Ripani, M. Khandaker, C. Salgado, M. J. Amaryan, K. L. Giovanetti, Larry Weinstein, D. Doughty, University of Connecticut (UCONN), Laboratoire de Physique Subatomique et de Cosmologie (LPSC), Université Joseph Fourier - Grenoble 1 (UJF)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Institut Polytechnique de Grenoble - Grenoble Institute of Technology-Centre National de la Recherche Scientifique (CNRS), Département de Physique Nucléaire (ex SPhN) (DPHN), Institut de Recherches sur les lois Fondamentales de l'Univers (IRFU), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, CLAS, and Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Institut Polytechnique de Grenoble - Grenoble Institute of Technology-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Joseph Fourier - Grenoble 1 (UJF)-Centre National de la Recherche Scientifique (CNRS)
Subjects: Physics, Nuclear and High Energy Physics, Particle physics, Scattering, FOS: Physical sciences, Large range, Electron, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], Deep inelastic scattering, High Energy Physics - Experiment, Settore FIS/04 - Fisica Nucleare e Subnucleare, High Energy Physics - Experiment (hep-ex), Pion, Reaction model, Statistical precision, [PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex], High Energy Physics::Experiment, Nuclear Experiment (nucl-ex), Nuclear Experiment
Abstract: We have measured the moment $A_{LU}^{\sin\phi}$ corresponding to the polarized electron beam-spin asymmetry in SIDIS. $A_{LU}^{\sin\phi}$ is a twist-3 quantity providing information about quark-gluon correlations. Data were taken with the CLAS Spectrometer at Jefferson Lab using a 5.498 GeV longitudinally polarized electron beam and an unpolarized liquid hydrogen target. All three pion channels ($\pi^+$, $\pi^0$ and $\pi^-$) were measured simultaneously over a large range of kinematics within the virtuality range $Q^2 \approx$ 1.0-4.5 GeV$^2$. The observable was measured with better than 1% statistical precision over a large range of $z$, $P_T$, $x_B$, and $Q^{2}$, which permits comparison with several reaction models. The discussed measurements provide an upgrade in statistics over previous measurements, and serve as the first evidence for the negative sign of the $\pi^{-}$ $\sin\phi$ moment., Comment: 16 pages, 18 figures
Published: 2014

70. Theep→e′pηReaction at and above theS11(1535)Baryon Resonance

Author: M. J. Amaryan, M. Taiuti, S. K. Matthews, J. Ficenec, Gyurjyan, W. Kim, A. Longhi, R. A. Schumacher, B. E. Bonner, L. Elouadrhiri, A. P. Freyberger, R. Magahiz, Robert E. Welsh, S. Dytman, S. Whisnant, B. M. Preedom, Federico Ronchetti, R. J. Feuerbach, K. L. Giovanetti, B. Asavapibhop, Michael Dugger, Shalev Gilad, De Sanctis E, A. V. Vlassov, G. Ricco, J. R. Kane, H. Avakian, Philip L. Cole, J. P. Cummings, G. S. Adams, Larry Weinstein, R. A. Miskimen, K. Joo, J. Shaw, R. W. Major, Moshe Gai, M. Kossov, W. J. Briscoe, D. Rowntree, D. Doughty, K. Beard, W. K. Brooks, Friedrich Klein, R. S. Hicks, Brian Raue, Kevin Fissum, Kalvir S. Dhuga, Barry Ritchie, A. Coleman, K. A. Griffioen, M. M. Ito, G. Riccardi, L. M. Qin, J. J. Manak, M. Mirazita, J. M. Laget, C. E. Hyde-Wright, J. W C McNabb, M. S. Ohandjanyan, D. Heddle, C. Salgado, H. R. Weller, Roy Thompson, Curtis Smith, D. P. Weygand, Herbert O. Funsten, S. A. Philips, Patrick Girard, Y. Kuang, H. Egiyan, M. Witkowski, Bernhard Mecking, Mestayer, A. J. Sarty, Jing Zhao, S. Stepanyan, De Vita R, D. G. Jenkins, C. Djalali, Z. L. Zhou, M. Lucas, Airton Deppman, D. I. Sober, A. Shafi, D. Hancock, Avraham Klein, Leskin Ga, M. Battaglieri, S. McAleer, William Bertozzi, E. Polli, E. Anciant, L. Farhi, G. E. Dodge, Daniel S. Carman, V. B. Gavrilov, O. Pogorelko, A. K. Opper, G. Audit, J. W. Price, M. Khandaker, E. Wolin, P. V. Degtyarenko, Y. Patois, Gerard Gilfoyle, Dinko Pocanic, L.C. Dennis, K. Loukachine, N. Pivnyuk, M. Bektasoglu, S. E. Kuhn, S. M. Shuvalov, D. Lawrence, M. Eckhause, J. Napolitano, M. Ripani, M. Guillo, Jochen Heisenberg, Y. V. Efremenko, Volker D. Burkert, M. Sanzone, J. Connelly, Donal Day, M. Sargsyan, G. A. Peterson, M. Guidal, A. V. Skabelin, J. Yun, D. Cords, A. Yegneswaran, A. S. Biselli, Elton Smith, S. Barrow, M. Holtrop, Thomas E. Smith, G. S. Mutchler, M. Anghinolfi, Hall Crannell, D. G. Crabb, James Mueller, S. Taylor, P. D. Rubin, G. Capitani, F. Roudot, D. J. Tedeschi, Y. G. Sharabian, M. Spraker, Sapunenko, R. C. Minehart, M. Klusman, Nicola Bianchi, S. Boiarinov, C. A. Meyer, J. S. McCarthy, B. Carnahan, Thierry Auger, A. R. Reolon, Michael Vineyard, C. Marchand, P. Rossi, P. Dragovitsch, F. W. Hersman, R. A. Demirchyan, T. Y. Tung, J. Hardie, K. Y. Kim, Muccifora, R. A. Niyazov, John T. O'Brien, P. Corvisiero, K. S. Egiyan, Calarco, P. Stoler, and K. Hicks
Subjects: Baryon, Physics, Nuclear physics, Particle physics, Photon, Amplitude, Angular distribution, Meson, Momentum transfer, General Physics and Astronomy, Resonance, Invariant (physics), Nuclear Experiment
Abstract: New cross sections for the reaction e p-->e p eta are reported for total center of mass energy W = 1.5--1.86 GeV and invariant momentum transfer Q2 = 0.25--1.5 (GeV/c)(2). This large kinematic range allows extraction of important new information about response functions, photocouplings, and eta N coupling strengths of baryon resonances. Newly observed structure at W approximately 1.65 GeV is shown to come from interference between S and P waves and can be interpreted with known resonances. Improved values are derived for the photon coupling amplitude for the S11(1535) resonance.
Published: 2001

71. Beam asymmetryΣforπ+andπ0photoproduction on the proton for photon energies from 1.102 to 1.862 GeV

Author: C. Hanretty, I. Bedlinskiy, Martin K. Mayer, Ron L. Workman, G. Rosner, M. S. Saini, O. Cortes, E. L. Isupov, Ye Tian, Sergey Kuleshov, B. S. Ishkhanov, S. Boiarinov, F. X. Girod, S. Strauch, E. De Sanctis, A. El Alaoui, Y. Ilieva, D. P. Watts, H. Egiyan, M. Aghasyan, Nicholas Zachariou, I. Zonta, D. I. Sober, P. Nadel-Turonski, D. Rimal, Friedrich Klein, Brian Raue, J. W. Price, C. Munoz Camacho, M. Contalbrigo, G. V. Fedotov, S. Chandavar, Michael Dugger, K. Joo, Yakov I. Azimov, K. P. Adhikari, D. P. Weygand, S. S. Stepanyan, S. Niccolai, H. Seraydaryan, M. Taiuti, W. Tang, Y. G. Sharabian, A. Kubarovsky, R. Dupre, N. A. Baltzell, M. Battaglieri, M. Osipenko, M. Ripani, F. Sabatié, George Davey Smith, T. Mineeva, P. Eugenio, D. Martinez, D. G. Ireland, V. Crede, K. Livingston, S. Koirala, E. Seder, I. I. Strakovsky, I. J. D. MacGregor, R. A. Montgomery, D. Adikaram, M. Guidal, M. Khandaker, A. Deur, A. D'Angelo, V. Mokeev, M. Holtrop, J. T. Goetz, J. A. Fleming, R. De Vita, Barry Ritchie, Luciano Pappalardo, M. J. Amaryan, L. El Fassi, C. Djalali, Lorenzo Zana, P. Collins, N. K. Walford, E. Golovatch, H. Hakobyan, H. Moutarde, H. S. Jo, J. J. Phillips, S. Park, E. Voutier, S. Anefalos Pereira, Z. W. Zhao, C. Salgado, P. Rossi, K. L. Giovanetti, J. Zhang, D. Ho, W. Kim, D. Doughty, K. A. Griffioen, G. Niculescu, D. Heddle, V. P. Kubarovsky, H. Y. Lu, W. Gohn, O. Pogorelko, S. Lewis, P. L. Cole, C. S. Nepali, B. Torayev, D. Protopopescu, Dustin Keller, S. Pozdniakov, I. Niculescu, S. Procureur, K. Hafidi, A. Celentano, R. W. Gothe, R. A. Schumacher, E. Munevar, Avraham Klein, H. Avakian, H. Voskanyan, W. J. Briscoe, E. Pasyuk, P. Stoler, K. Hicks, S. Tkachenko, L. Guo, N. Harrison, S. Pisano, Diane Schott, A. I. Ostrovidov, K. Park, Volker D. Burkert, A. S. Biselli, N. Dashyan, S. Fegan, R. Paremuzyan, Gerard Gilfoyle, J. P. Ball, Y. Prok, D. S. Carman, D. Sokhan, B. McKinnon, M. Mirazita, E. Phelps, N. Gevorgyan, and V. Batourine
Subjects: Physics, Nuclear and High Energy Physics, Particle physics, Photon, Proton, 010308 nuclear & particles physics, Scattering, media_common.quotation_subject, Partial wave analysis, 01 natural sciences, 7. Clean energy, Asymmetry, Nuclear physics, Pion, 0103 physical sciences, Nuclear Experiment, 010306 general physics, Energy (signal processing), Beam (structure), media_common
Abstract: Beam asymmetries for the reactions $\ensuremath{\gamma}p\ensuremath{\rightarrow}p{\ensuremath{\pi}}^{0}$ and $\ensuremath{\gamma}p\ensuremath{\rightarrow}n{\ensuremath{\pi}}^{+}$ have been measured with the CEBAF Large Acceptance Spectrometer (CLAS) and a tagged, linearly polarized photon beam with energies from 1.102--1.862 GeV. A Fourier moment technique for extracting beam asymmetries from experimental data is described. The results reported here possess greater precision and finer energy resolution than previous measurements. Our data for both pion reactions appear to favor the SAID and Bonn-Gatchina scattering analyses over the older Mainz MAID predictions. After incorporating the present set of beam asymmetries into the world database, exploratory fits made with the SAID analysis indicate that the largest changes from previous fits are for properties of the $\ensuremath{\Delta}(1700)3/{2}^{\ensuremath{-}}$ and $\ensuremath{\Delta}(1905)5/{2}^{+}$ states.
Published: 2013

72. Measurement of the Spin Asymmetry in the Photoproduction of Pairs of High-pTHadrons at HERMES

Author: A. Airapetian, N. Akopov, M. Amarian, E. C. Aschenauer, H. Avakian, R. Avakian, A. Avetissian, B. Bains, C. Baumgarten, M. Beckmann, S. Belostotski, J. E. Belz, Th. Benisch, S. Bernreuther, N. Bianchi, J. Blouw, H. Böttcher, A. Borissov, J. Brack, S. Brauksiepe, B. Braun, W. Brückner, A. Brüll, H. J. Bulten, G. P. Capitani, P. Carter, P. Chumney, E. Cisbani, G. R. Court, P. F. Dalpiaz, E. De Sanctis, D. De Schepper, E. Devitsin, P. K. A. de Witt Huberts, P. Di Nezza, M. Düren, A. Dvoredsky, G. Elbakian, J. Ely, A. Fantoni, M. Ferstl, K. Fiedler, B. W. Filippone, H. Fischer, B. Fox, J. Franz, S. Frullani, M.-A. Funk, Y. Gärber, F. Garibaldi, G. Gavrilov, P. Geiger, V. Gharibyan, A. Golendukhin, G. Graw, O. Grebeniouk, P. W. Green, L. G. Greeniaus, C. Grosshauser, M. Guidal, A. Gute, W. Haeberli, J.-O. Hansen, D. Hasch, O. Häusser, F. H. Heinsius, R. Henderson, M. Henoch, R. Hertenberger, Y. Holler, R. J. Holt, W. Hoprich, H. Ihssen, M. Iodice, A. Izotov, H. E. Jackson, A. Jgoun, R. Kaiser, E. Kinney, A. Kisselev, P. Kitching, H. Kobayashi, N. Koch, K. Königsmann, M. Kolstein, H. Kolster, V. Korotkov, W. Korsch, V. Kozlov, L. H. Kramer, M. Kurisuno, G. Kyle, W. Lachnit, W. Lorenzon, N. C. R. Makins, F. K. Martens, J. W. Martin, F. Masoli, A. Mateos, M. McAndrew, K. McIlhany, R. D. McKeown, F. Meissner, F. M. Menden, A. Metz, N. Meyners, O. Mikloukho, C. A. Miller, M. A. Miller, R. Milner, A. Most, V. Muccifora, Y. Naryshkin, A. M. Nathan, F. Neunreither, M. Niczyporuk, W.-D. Nowak, T. G. O'Neill, R. Openshaw, J. Ouyang, B. R. Owen, S. F. Pate, S. Potashov, D. H. Potterveld, G. Rakness, R. Redwine, A. R. Reolon, R. Ristinen, K. Rith, P. Rossi, S. Rudnitsky, M. Ruh, D. Ryckbosch, Y. Sakemi, C. Scarlett, A. Schäfer, F. Schmidt, H. Schmitt, G. Schnell, K. P. Schüler, A. Schwind, J. Seibert, T.-A. Shibata, K. Shibatani, T Shin, V. Shutov, C. Simani, A. Simon, K. Sinram, P. Slavich, M. Spengos, E. Steffens, J. Stenger, J. Stewart, U. Stoesslein, M. Sutter, H. Tallini, S. Taroian, A. Terkulov, B. Tipton, M. Tytgat, G. M. Uriuoli, R. van de Vyver, J. F. J. van den Brand, G. van der Steenhoven, J. J. van Hunen, M. C. Vetterli, V. Vikhrov, M. G. Vincter, J. Visser, E. Volk, W. Wander, J. Wendland, S. E. Williamson, T. Wise, K. Woller, S. Yoneyama, and H. Zohrabian
Subjects: HERMES experiment, Physics, Particle physics, media_common.quotation_subject, Hadron, General Physics and Astronomy, HERA, Polarization (waves), Deep inelastic scattering, Asymmetry, Gluon, Nuclear physics, High Energy Physics::Experiment, Nuclear Experiment, Storage ring, media_common
Abstract: We present a measurement of the longitudinal spin asymmetry A|| in photoproduction of pairs of hadrons with high transverse momentum pT. Data were accumulated by the HERMES experiment using a 27.5 GeV polarized positron beam and a polarized hydrogen target internal to the HERA storage ring. For h^+h^- pairs with _(pT)^(h1)>1.5GeV/c and _(pT)^(h2)>1.0GeV/c, the measured asymmetry is A_(||) = -0.28±0.12(stat)±0.02(syst). This negative value is in contrast to the positive asymmetries typically measured in deep inelastic scattering from protons, and is interpreted to arise from a positive gluon polarization.
Published: 2000

73. Nuclear effects on R=σL/σT in deep-inelastic scattering

Author: K Ackerstaff, A Airapetian, N Akopov, I Akushevich, M Amarian, E.C Aschenauer, H Avakian, R Avakian, A Avetissian, B Bains, C Baumgarten, M Beckmann, S Belostotski, J.E Belz, Th Benisch, S Bernreuther, N Bianchi, J Blouw, H Böttcher, A Borissov, M Bouwhuis, J Brack, S Brauksiepe, B Braun, B Bray, St Brons, W Brückner, A Brüll, E.E.W Bruins, H.J Bulten, G.P Capitani, P Carter, P Chumney, E Cisbani, G.R Court, P.F Dalpiaz, E De Sanctis, D De Schepper, E Devitsin, P.K.A de Witt Huberts, P Di Nezza, M Düren, A Dvoredsky, G Elbakian, J Ely, A Fantoni, A Fechtchenko, M Ferstl, K Fiedler, B.W Filippone, H Fischer, B Fox, J Franz, S Frullani, M.-A Funk, Y Gärber, H Gao, F Garibaldi, G Gavrilov, P Geiger, V Gharibyan, A Golendukhin, G Graw, O Grebeniouk, P.W Green, L.G Greeniaus, C Grosshauser, M Guidal, A Gute, V Gyurjyan, J.P Haas, W Haeberli, J.-O Hansen, M Hartig, D Hasch, O Häusser, F.H Heinsius, R Henderson, M Henoch, R Hertenberger, Y Holler, R.J Holt, W Hoprich, H Ihssen, M Iodice, A Izotov, H.E Jackson, A Jgoun, R Kaiser, E Kinney, M Kirsch, A Kisselev, P Kitching, H Kobayashi, N Koch, K Königsmann, M Kolstein, H Kolster, V Korotkov, W Korsch, V Kozlov, L.H Kramer, V.G Krivokhijine, M Kurisuno, G Kyle, W Lachnit, P Lenisa, W Lorenzon, N.C.R Makins, F.K Martens, J.W Martin, F Masoli, A Mateos, M McAndrew, K McIlhany, R.D McKeown, F Meissner, F Menden, A Metz, N Meyners, O Mikloukho, C.A Miller, M.A Miller, R Milner, A Most, V Muccifora, R Mussa, A Nagaitsev, Yu Naryshkin, A.M Nathan, F Neunreither, J.M Niczyporuk, W.-D Nowak, M Nupieri, T.G O'Neill, R Openshaw, J Ouyang, B.R Owen, V Papavassiliou, S.F Pate, M Pitt, S Potashov, D.H Potterveld, G Rakness, A Reali, R Redwine, A.R Reolon, R Ristinen, K Rith, P Rossi, S Rudnitsky, M Ruh, D Ryckbosch, Y Sakemi, I Savin, C Scarlett, A Schäfer, F Schmidt, H Schmitt, G Schnell, K.P Schüler, A Schwind, J Seibert, T.-A Shibata, K Shibatani, T Shin, V Shutov, C Simani, A Simon, K Sinram, P Slavich, M Spengos, E Steffens, J Stenger, J Stewart, U Stoesslein, M Sutter, H Tallini, S Taroian, A Terkulov, E Thomas, B Tipton, M Tytgat, G.M Urciuoli, J.F.J van den Brand, G van der Steenhoven, R van de Vyver, J.J van Hunen, M.C Vetterli, V Vikhrov, M.G Vincter, J Visser, E Volk, W Wander, J Wendland, S.E Williamson, T Wise, K Woller, S Yoneyama, and H Zohrabian
Subjects: Physics, HERMES experiment, Nuclear and High Energy Physics, Particle physics, 010308 nuclear & particles physics, Scattering, Sigma, DESY, Deep inelastic scattering, 01 natural sciences, Nuclear physics, Transverse plane, Cross section (physics), 0103 physical sciences, 010306 general physics, Scaling
Abstract: Cross section ratios for deep-inelastic scattering from 14N and 3He with respect to 2H have been measured by the HERMES experiment at DESY using a 27.5 GeV positron beam. The data cover a range in the Bjorken scaling variable x between 0.013 and 0.65, while the negative squared four-momentum transfer Q^2 varies from 0.5 to 15 GeV^2. The data are compared to measurements performed by NMC, E665, and SLAC on 4He and 12C, and are found to be different for x < 0.06 and Q^2 < 1.5 GeV^2. The observed difference is attributed to an A-dependence of the ratio R = sigma_L / sigma_T of longitudinal to transverse deep-inelastic scattering cross sections at low x and low Q^2.
Published: 2000

74. Observation of a Coherence Length Effect in Exclusiveρ0Electroproduction

Author: K. Ackerstaff, A. Airapetian, N. Akopov, I. Akushevich, M. Amarian, E. C. Aschenauer, H. Avakian, R. Avakian, A. Avetissian, B. Bains, S. Barrow, C. Baumgarten, M. Beckmann, St. Belostotski, J. E. Belz, Th. Benisch, S. Bernreuther, N. Bianchi, S. Blanchard, J. Blouw, H. Böttcher, A. Borissov, J. Brack, S. Brauksiepe, B. Braun, B. Bray, St. Brons, W. Brückner, A. Brüll, E. E. W. Bruins, H. J. Bulten, R. V. Cadman, G. P. Capitani, P. Carter, P. Chumney, E. Cisbani, G. R. Court, P. F. Dalpiaz, P. P. J. Delheij, E. De Sanctis, D. De Schepper, E. Devitsin, P. K. A. de Witt Huberts, P. Di Nezza, M. Düren, A. Dvoredsky, G. Elbakian, J. Ely, J. Emerson, A. Fantoni, A. Fechtchenko, M. Ferstl, D. Fick, K. Fiedler, B. W. Filippone, H. Fischer, H. T. Fortune, B. Fox, S. Frabetti, J. Franz, S. Frullani, M.-A. Funk, N. D. Gagunashvili, P. Galumian, H. Gao, Y. Gärber, F. Garibaldi, G. Gavrilov, P. Geiger, V. Gharibyan, V. Giordjian, A. Golendukhin, G. Graw, O. Grebeniouk, P. W. Green, L. G. Greeniaus, C. Grosshauser, M. G. Guidal, A. Gute, V. Gyurjyan, J. P. Haas, W. Haeberli, J.-O. Hansen, D. Hasch, O. Häusser, F. H. Heinsius, R. S. Henderson, Th. Henkes, M. Henoch, R. Hertenberger, Y. Holler, R. J. Holt, W. Hoprich, H. Ihssen, M. Iodice, A. Izotov, H. E. Jackson, A. Jgoun, C. Jones, R. Kaiser, E. Kinney, M. Kirsch, A. Kisselev, P. Kitching, H. Kobayashi, N. Koch, K. Königsmann, M. Kolstein, H. Kolster, V. Korotkov, W. Korsch, V. Kozlov, L. H. Kramer, B. Krause, V. G. Krivokhijine, M. Kückes, F. Kümmell, G. Kyle, W. Lachnit, W. Lorenzon, A. Lung, N. C. R. Makins, F. K. Martens, J. W. Martin, F. Masoli, A. Mateos, M. McAndrew, K. McIlhany, R. D. McKeown, F. Meissner, F. Menden, D. Mercer, A. Metz, N. Meyners, O. Mikloukho, C. A. Miller, M. A. Miller, R. G. Milner, V. Mitsyn, A. Most, R. Mozzetti, V. Muccifora, A. Nagaitsev, Y. Naryshkin, A. M. Nathan, F. Neunreither, M. Niczyporuk, W.-D. Nowak, M. Nupieri, P. Oelwein, H. Ogami, T. G. O'Neill, R. Openshaw, J. Ouyang, B. R. Owen, V. Papavassiliou, S. F. Pate, M. Pitt, H. R. Poolman, S. Potashov, D. H. Potterveld, B. Povh, G. Rakness, A. Reali, R. Redwine, A. R. Reolon, R. Ristinen, K. Rith, H. Roloff, G. Röper, P. Rossi, S. Rudnitsky, M. Ruh, D. Ryckbosch, Y. Sakemi, I. Savin, C. Scarlett, F. Schmidt, H. Schmitt, G. Schnell, K. P. Schüler, A. Schwind, J. Seibert, T.-A. Shibata, T. Shin, V. Shutov, C. Simani, A. Simon, K. Sinram, P. Slavich, J. Sowinski, M. Spengos, E. Steffens, J. Stenger, J. Stewart, F. Stock, U. Stoesslein, M. Sutter, H. Tallini, S. Taroian, A. Terkulov, D. M. Thiessen, E. Thomas, B. Tipton, A. Trudel, M. Tytgat, G. M. Urciuoli, J. J. van Hunen, R. van de Vyver, J. F. J. van den Brand, G. van der Steenhoven, M. C. Vetterli, V. Vikhrov, M. Vincter, J. Visser, E. Volk, W. Wander, T. P. Welch, S. E. Williamson, T. Wise, T. Wölfel, K. Woller, S. Yoneyama, K. Zapfe-Düren, H. Zohrabian, and R. Zurmühle
Subjects: Physics, HERMES experiment, Particle physics, Meson, 010308 nuclear & particles physics, High Energy Physics::Lattice, High Energy Physics::Phenomenology, Nuclear Theory, General Physics and Astronomy, Virtual particle, 01 natural sciences, Coherence length, Positron energy, Nuclear physics, Deuterium, Nuclear transparency, 0103 physical sciences, High Energy Physics::Experiment, Nuclear Experiment, 010306 general physics, Nucleon
Abstract: Exclusive incoherent electroproduction of the ρ0(770) meson from 1H, 2H, 3He, and 14N targets has been studied by the HERMES experiment at squared four-momentum transfer Q^2>0.4 GeV^2 and positron energy loss ν from 9 to 20 GeV. The ratio of the 14N to 1H cross sections per nucleon, known as the nuclear transparency, was found to decrease with increasing coherence length of quark-antiquark fluctuations of the virtual photon. The data provide clear evidence of the interaction of the quark-antiquark fluctuations with the nuclear medium.
Published: 1999

75. Beam-induced nuclear depolarization in a gaseous polarized-hydrogen target

Author: Yasuhiro Sakemi, Valeri Valentinovitch Mitsyn, R. P. Redwine, G. van der Steenhoven, J. van Hunen, L. G. Greeniaus, A. Gute, L. H. Kramer, E. Volk, P. Chumney, S. Frullani, H. Schmitt, F. Stock, Ross Milner, T. A. Shibata, E. De Sanctis, R.O. Avakian, A. Metz, N. Koch, J. Franz, H. Kolster, M.-A. Funk, J.-O. Hansen, A.O. Mateos, A. Borissov, B. D. Fox, E. Devitsin, E. Cisbani, S. Potashov, H. Zohrabian, A. R. Reolon, A. Avetissian, K. McIlhany, I.A. Savin, K. Sinram, R. J. Holt, A. Izotov, T. Wise, F. Masoli, F. Neunreither, J. Blouw, S. Bernreuther, Alan M. Nathan, G.R. Court, F. Schmidt, R. V. Cadman, V. A. Korotkov, N.D. Gagunashvili, Y. Gärber, M. Beckmann, M. McAndrew, G. S. Kyle, H. J. Bulten, Michael Pitt, J. F. J. van den Brand, Th. Henkes, J. Stewart, V. Gharibyan, W. Haeberli, S. Frabetti, A. Brull, Brons, M. Ferstl, M. Sutter, M. Amarian, K. Ackerstaff, Klaus Rith, Robert Henderson, E. R. Kinney, Wolfgang Korsch, A. Reali, E. E. W. Bruins, H. Avakian, A. Airapetian, W. Wander, A. Dvoredsky, A. Nagaitsev, E. C. Aschenauer, H. E. Jackson, V. G. Krivokhijine, K. Königsmann, O. Häusser, G. P. Capitani, Y. Naryshkin, H. Ihssen, Michel Vetterli, M. Kolstein, Haiyan Gao, O. Grebeniouk, Ralf Hertenberger, M. Ruh, A. Schwind, A. Simon, F. K. Martens, M. Nupieri, G. Elbakian, W. Brückner, C. Baumgarten, M. Spengos, P. Di Nezza, S. Brauksiepe, N. Akopov, Michael Tytgat, V. Giordjian, A. Golendukhin, S. I. Manaenkov, M. A. Miller, G. Rakness, M. Henoch, P. Geiger, P. Slavich, V. A. Kozlov, S. Taroian, F. Meissner, P. Rossi, W. Lachnit, D. De Schepper, C. Grosshauser, R. A. Ristinen, Y. Holler, Alessandra Fantoni, N. Meyners, B. R. Owen, H.O. Roloff, P. F. Dalpiaz, G. Graw, D. Hasch, D. H. Potterveld, K. Zapfe-Düren, H. Böttcher, S. F. Pate, Jeffrey Brack, B. W. Filippone, F. Garibaldi, J. Stenger, D. Fick, J. E. Belz, R. D. McKeown, P.K.A. de Witt Huberts, M. Niczyporuk, A. Jgoun, Mauro Iodice, V. Papavassiliou, Belostotski, S. Yoneyama, R. Van de Vyver, G. M. Urciuoli, W.-D. Nowak, H. Ogami, T. Shin, Manuella Vincter, A. Kisselev, H. Tallini, Wolfgang Lorenzon, W. Hoprich, U. Stoesslein, H. Fischer, J. W. Martin, S. Rudnitsky, Dirk Ryckbosch, J. Sowinski, B. Tipton, Hiroaki Kobayashi, K. Fiedler, K. Woller, Thomas O'Neill, P.W. Green, B. Braun, K. P. Schüler, Nicola Bianchi, O. Mikloukho, V. Shutov, B. Bains, C. Simani, Naomi C R Makins, R. Mozzetti, Ralf Kaiser, E. Steffens, G. Gavrilov, A. Fechtchenko, B. Bray, P. Kitching, Th. Benisch, M. Düren, P. Carter, C. A. Miller, Adel Terkulov, Valeria Muccifora, G. Schnell, S. E. Williamson, and (Astro)-Particles Physics
Subjects: HERMES experiment, Physics, Hydrogen, General Physics and Astronomy, chemistry.chemical_element, FOS: Physical sciences, DESY, Depolarization, HERA, Magnetic field, High Energy Physics - Experiment, NO, High Energy Physics - Experiment (hep-ex), Bunches, chemistry, Physics::Accelerator Physics, High Energy Physics::Experiment, Atomic physics, Beam (structure)
Abstract: Spin-polarised atomic hydrogen is used as a gaseous polarised proton target in high energy and nuclear physics experiments operating with internal beams in storage rings. When such beams are intense and bunched, this type of target can be depolarised by a resonant interaction with the transient magnetic field generated by the beam bunches. This effect has been studied with the HERA positron beam in the HERMES experiment at DESY. Resonances have been observed and a simple analytic model has been used to explain their shape and position. Operating conditions for the experiment have been found where there is no significant target depolarisation due to this effect., REVTEX, 6 pages, 5 figures
Published: 1999

76. Measurement of the proton spin structure function g(1)(p) with a pure hydrogen target

Author: A. Airapetian, N. Akopov, I. Akushevich, M. Amarian, E.C. Aschenauer, H. Avakian, R. Avakian, A. Avetissian, B. Bains, C. Baumgarten, M. Beckmann, St. Belostotski, E. Belz, Th. Benisch, S. Bernreuther, N. Bianchi, J. Blouw, H. Böttcher, A. Borissov, J. Brack, S. Brauksiepe, B. Braun, St. Brons, W. Brückner, A. Brüll, H.J. Bulten, G.P. Capitani, P. Carter, P. Chumney, E. Cisbani, G.R. Court, P.F. Dalpiaz, R. De Leo, E. De Sanctis, D. De Schepper, E. Devitsin, P.K.A. de Witt Huberts, P. Di Nezza, M. Düren, A. Dvoredsky, G. Elbakian, J. Ely, A. Fantoni, A. Fechtchenko, M. Ferstl, D. Fick, K. Fiedler, B.W. Filippone, H. Fischer, B. Fox, S. Frabetti, J. Franz, S. Frullani, M.-A. Funk, N.D. Gagunashvili, H. Gao, Y. Gärber, F. Garibaldi, G. Gavrilov, P. Geiger, V. Gharibyan, V. Giordjian, A. Golendukhin, G. Graw, O. Grebeniouk, P.W. Green, L.G. Greeniaus, C. Grosshauser, M. Guidal, A. Gute, W. Haeberli, J.-O. Hansen, D. Hasch, F.H. Heinsius, M. Henoch, R. Hertenberger, Y. Holler, R.J. Holt, W. Hoprich, H. Ihssen, M. Iodice, A. Izotov, H.E. Jackson, A. Jgoun, R. Kaiser, E. Kinney, A. Kisselev, P. Kitching, H. Kobayashi, N. Koch, K. Königsmann, M. Kolstein, H. Kolster, V. Korotkov, W. Korsch, V. Kozlov, L.H. Kramer, V.G. Krivokhijine, F. Kümmell, M. Kurisuno, G. Kyle, W. Lachnit, W. Lorenzon, N.C.R. Makins, S.I. Manaenkov, K. Martens, J.W. Martin, H. Marukyan, F. Masoli, A. Mateos, M. McAndrew, K. McIlhany, R.D. McKeown, F. Meißner, F. Menden, A. Metz, N. Meyners, O. Mikloukho, C.A. Miller, M.A. Miller, R. Milner, V. Mitsyn, A. Most, V. Muccifora, A. Nagaitsev, E. Nappi, Y. Naryshkin, A.M. Nathan, F. Neunreither, W.-D. Nowak, T.G. O'Neill, B.R. Owen, J. Ouyang, V. Papavassiliou, S.F. Pate, S. Potashov, D.H. Potterveld, G. Rakness, A. Reali, R. Redwine, A.R. Reolon, R. Ristinen, K. Rith, H. Roloff, P. Rossi, S. Rudnitsky, M. Ruh, D. Ryckbosch, Y. Sakemi, I. Savin, C. Scarlett, F. Schmidt, H. Schmitt, G. Schnell, K.P. Schüler, A. Schwind, J. Seibert, T.-A. Shibata, K. Shibatani, T. Shin, V. Shutov, C. Simani, A. Simon, K. Sinram, P. Slavich, M. Spengos, E. Steffens, J. Stenger, J. Stewart, U. Stößlein, M. Sutter, H. Tallini, S. Taroian, A. Terkulov, B. Tipton, M. Tytgat, G.M. Urciuoli, R. Van de Vyver, J.F.J. van den Brand, G. van der Steenhoven, J.J. van Hunen, M.C. Vetterli, M. Vincter, J. Visser, E. Volk, W. Wander, S.E. Williamson, T. Wise, K. Woller, S. Yoneyama, H. Zohrabian, and (Astro)-Particles Physics
Subjects: Nuclear and High Energy Physics, Particle physics, POLARIZATION, Hydrogen, Positron beam, FOS: Physical sciences, chemistry.chemical_element, 01 natural sciences, High Energy Physics - Experiment, High Energy Physics - Experiment (hep-ex), DEUTERON STRUCTURE FUNCTIONS, 0103 physical sciences, Proton spin crisis, Nuclear Experiment, 010306 general physics, Physics, DEEP-INELASTIC-SCATTERING, Range (particle radiation), F-2(P), 010308 nuclear & particles physics, Scattering, Structure function, HERA, 3. Good health, chemistry, Physics::Accelerator Physics, High Energy Physics::Experiment, Astrophysics::Earth and Planetary Astrophysics, Atomic physics, Storage ring
Abstract: A measurement of the proton spin structure function g1p(x,Q^2) in deep-inelastic scattering is presented. The data were taken with the 27.6 GeV longitudinally polarised positron beam at HERA incident on a longitudinally polarised pure hydrogen gas target internal to the storage ring. The kinematic range is 0.021, Comment: 7 pages, 3 figures, 1 table, RevTeX latex
Published: 1998

77. Investigations of azimuthal asymmetry in semi-inclusive leptoproduction

Author: Nicola Bianchi, K. A. Oganessyan, P. Di Nezza, and H. Avakian
Subjects: Physics, Mathematics::Functional Analysis, Particle physics, Physics and Astronomy (miscellaneous), High Energy Physics::Lattice, High Energy Physics::Phenomenology, FOS: Physical sciences, Nonlinear Sciences::Chaotic Dynamics, High Energy Physics - Phenomenology, Mathematics::Group Theory, High Energy Physics - Phenomenology (hep-ph), Azimuthal asymmetry, High Energy Physics::Experiment, Engineering (miscellaneous)
Abstract: We consider the azimuthal asymmetries in semi-inclusive deep inelastic leptoproduction arising due to both perturbative and nonperturbative effects at HERMES energies and show that the $k_T^2/Q^2$ order corrections to $< \cos��>$ and $< \cos2��>$ are significant. We also reconsider the results of perturbative effects for $< \cos��>$ at large momentum transfers \cite{A1} using the more recent sets of scale-dependent distribution and fragmentation functions, which bring up to $18{%}$ difference in $< \cos��>$. In the same approach we calculate the $< \cos2��>$ as well., 8 pages, LaTeX, 6 PS figures, final version, to appear in EPJC
Published: 1998

78. The HERMES spectrometer

Author: K. Ackerstaff, A. Airapetian, N. Akopov, M. Amarian, V. Andreev, E.C. Aschenauer, R. Avakian, H. Avakian, A. Avetissian, B. Bains, S. Barrow, W. Beckhusen, M. Beckmann, St. Belostotski, E. Belz, Th. Benisch, S. Bernreuther, N. Bianchi, J. Blouw, H. Böttcher, A. Borissov, J. Brack, B. Braun, B. Bray, S. Brons, W. Brückner, A. Brüll, H.J. Bulten, G.P. Capitani, P. Carter, P. Chumney, E. Cisbani, S. Clark, S. Colilli, H. Coombes, G.R. Court, P. Delheij, E. Devitsin, C.W. de Jager, E. De Sanctis, D. De Schepper, P.K.A. de Witt Huberts, P. Di Nezza, M. Doets, M. Düren, A. Dvoredsky, G. Elbakian, J. Emerson, A. Fantoni, A. Fechtchenko, M. Ferstl, D. Fick, K. Fiedler, B.W. Filippone, H. Fischer, H.T. Fortune, J. Franz, S. Frullani, M.-A. Funk, N.D. Gagunashvili, P. Galumian, H. Gao, Y. Gärber, F. Garibaldi, G. Gavrilov, P. Geiger, V. Gharibyan, V. Giordjian, F. Giuliani, A. Golendoukhin, B. Grabowski, G. Graw, O. Grebeniouk, P. Green, G. Greeniaus, M. Gricia, C. Grosshauser, A. Gute, J.P. Haas, K. Hakelberg, W. Haeberli, J.-O. Hansen, D. Hasch, O. Hausser, R. Henderson, Th. Henkes, R. Hertenberger, Y. Holler, R.J. Holt, H. Ihssen, A. Izotov, M. Iodice, H.E. Jackson, A. Jgoun, C. Jones, R. Kaiser, J. Kelsey, E. Kinney, M. Kirsch, A. Kisselev, P. Kitching, H. Kobayashi, E. Kok, K. Königsmann, M. Kolstein, H. Kolster, W. Korsch, S. Kozlov, V. Kozlov, R. Kowalczyk, L. Kramer, B. Krause, A. Krivchitch, V.G. Krivokhijine, M. Kueckes, P. Kutt, G. Kyle, W. Lachnit, R. Langstaff, W. Lorenzon, M. Lucentini, A. Lung, N. Makins, V. Maleev, S.I. Manaenkov, K. Martens, A. Mateos, K. McIlhany, R.D. McKeown, F. Meißner, F. Menden, D. Mercer, A. Metz, N. Meyners, O. Mikloukho, C.A. Miller, M.A. Miller, R. Milner, V. Mitsyn, G. Modrak, J. Morton, A. Most, R. Mozzetti, V. Muccifora, A. Nagaitsev, Y. Naryshkin, A.M. Nathan, F. Neunreither, M. Niczyporuk, W.-D. Nowak, M. Nupieri, P. Oelwein, H. Ogami, T.G. O’Neill, R. Openshaw, V. Papavassiliou, S.F. Pate, S. Patrichev, M. Pitt, H.J. Plett, H.R. Poolman, S. Potashov, D. Potterveld, B. Povh, V. Prahl, G. Rakness, V. Razmyslovich, R. Redwine, A.R. Reolon, R. Ristinen, K. Rith, H.O. Roloff, G. Röper, P. Rossi, S. Rudnitsky, H. Russo, D. Ryckbosch, Y. Sakemi, F. Santavenere, I. Savin, F. Schmidt, H. Schmitt, G. Schnell, K.P. Schüler, A. Schwind, T.-A. Shibata, T. Shin, B. Siebels, A. Simon, K. Sinram, W.R. Smythe, J. Sowinski, M. Spengos, K. Sperber, E. Steffens, J. Stenger, J. Stewart, F. Stock, U. Stößlein, M. Sutter, H. Tallini, S. Taroian, A. Terkulov, D. Thiessen, B. Tipton, V. Trofimov, A. Trudel, M. Tytgat, G.M. Urciuoli, R. Van de Vyver, J.F.J. van den Brand, G. van der Steenhoven, J.J. van Hunen, D. van Westrum, A. Vassiliev, M.C. Vetterli, M.G. Vincter, E. Volk, W. Wander, T.P. Welch, S.E. Williamson, T. Wise, G. Wöbke, K. Woller, S. Yoneyama, K. Zapfe-Düren, T. Zeuli, H. Zohrabian, and (Astro)-Particles Physics
Subjects: HERMES experiment, Nuclear and High Energy Physics, Particle physics, semi-inclusive scattering, (e, Physics::Instrumentation and Detectors, Cherenkov detector, CALORIMETERS, FOS: Physical sciences, deep inelastic lepton scattering, (e,e''h), Tracking (particle physics), Particle identification, High Energy Physics - Experiment, INORGANIC MATERIALS, law.invention, High Energy Physics - Experiment (hep-ex), e''h), GAS-MIXTURES, law, Nuclear Experiment, Instrumentation, Physics, Calorimeter (particle physics), Spectrometer, PERFORMANCE, magnetic spectrometer, Deep inelastic scattering, Transition radiation detector, CHAMBERS, High Energy Physics::Experiment
Abstract: The HERMES experiment is collecting data on inclusive and semi-inclusive deep inelastic scattering of polarised positrons from polarised targets of H, D, and He. These data give information on the spin structure of the nucleon. This paper describes the forward angle spectrometer built for this purpose. The spectrometer includes numerous tracking chambers (micro-strip gas chambers, drift and proportional chambers) in front of and behind a 1.3 T.m magnetic field, as well as an extensive set of detectors for particle identification (a lead-glass calorimeter, a pre-shower detector, a transition radiation detector, and a threshold Cherenkov detector). Two of the main features of the spectrometer are its good acceptance and identification of both positrons and hadrons, in particular pions. These characteristics, together with the purity of the targets, are allowing HERMES to make unique contributions to the understanding of how the spins of the quarks contribute to the spin of the nucleon., 37 pages, 32 figures, 4 tables
Published: 1998

79. Measurement of the neutron spin structure function g with a polarized 3He internal target

Author: K. Ackerstaff, A. Airapetian, I. Akushevich, N. Akopov, M. Amarian, E.C. Aschenauer, R. Avakian, H. Avakian, A. Avetissian, B. Bains, S. Barrow, M. Beckmann, S. Belostotski, J.E. Belz, Th. Benisch, S. Bernreuther, N. Bianchi, S. Blanchard, J. Blouw, H. Böttcher, A. Borissov, J. Brack, B. Braun, B. Bray, W. Brückner, A. Brüll, E.E.W. Bruins, H.J. Bulten, G.P. Capitani, P. Carter, E. Cisbani, G.R. Court, P.P.J. Delheij, E. Devitsin, C.W. de Jager, E. De Sanctis, D. De Schepper, P.K.A. de Witt Huberts, M. Düren, A. Dvoredsky, G. Elbakian, J. Emerson, A. Fantoni, A. Fechtchenko, M. Ferstl, D. Fick, K. Fiedler, B.W. Filippone, H. Fischer, H.T. Fortune, J. Franz, S. Frullani, M.-A. Funk, N.D. Gagunashvili, P. Galumian, H. Gao, Y. Gärber, F. Garibaldi, P. Geiger, V. Gharibyan, A. Golendoukhin, G. Graw, O. Grebeniouk, P.W. Green, L.G. Greeniaus, C. Grosshauser, A. Gute, V. Gyurjyan, J.P. Haas, W. Haeberli, J.-O. Hansen, D. Hasch, O. Häusser, R.S. Henderson, Th. Henkes, R. Hertenberger, Y. Holler, R.J. Holt, H. Ihssen, M. Iodice, A. Izotov, H.E. Jackson, A. Jgoun, C. Jones, R. Kaiser, E. Kinney, M. Kirsch, A. Kisselev, P. Kitching, N. Koch, K. Königsmann, M. Kolstein, H. Kolster, W. Korsch, V. Kozlov, L.H. Kramer, B. Krause, V.G. Krivokhijine, M. Kückes, G. Kyle, W. Lachnit, W. Lorenzon, A. Lung, N.C.R. Makins, S.I. Manaenkov, F.K. Martens, J.W. Martin, A. Mateos, K. McIlhany, R.D. McKeown, F. Meissner, D. Mercer, A. Metz, N. Meyners, O. Mikloukho, C.A. Miller, M.A. Miller, R.G. Milner, V. Mitsyn, A. Most, R. Mozzetti, V. Muccifora, A. Nagaitsev, Y. Naryshkin, A.M. Nathan, F. Neunreither, M. Niczyporuk, W.-D. Nowak, M. Nupieri, P. Oelwein, H. Ogami, T.G. O'Neill, R. Openshaw, V. Papavassiliou, S.F. Pate, M. Pitt, S. Potashov, D.H. Potterveld, B. Povh, G. Rakness, R. Redwine, A.R. Reolon, R. Ristinen, K. Rith, G. Röper, H. Roloff, P. Rossi, S. Rudnitsky, M. Ruh, D. Ryckbosch, Y. Sakemi, I. Savin, K.P. Schüller, A. Schwind, T.-A. Shibata, T. Shin, A. Simon, K. Sinram, W.R. Smythe, J. Sowinski, M. Spengos, E. Steffens, J. Stenger, J. Stewart, F. Stock, U. Stoesslein, M. Sutter, H. Tallini, S. Taroian, A. Terkulov, D.M. Thiessen, B. Tipton, A. Trudel, M. Tytgat, G.M. Urciuoli, R. Van de Vyver, J.F.J. van den Brand, G. van der Steenhoven, M.C. Vetterli, E. Volk, W. Wander, T.P. Welch, S.E. Williamson, T. Wise, T. Wölfel, K. Zapfe-Düren, H. Zohrabian, and R. Zurmühle
Subjects: Physics, HERMES experiment, Nuclear and High Energy Physics, Range (particle radiation), 010308 nuclear & particles physics, Astrophysics::Cosmology and Extragalactic Astrophysics, HERA, Spin structure, Deep inelastic scattering, 01 natural sciences, Nuclear physics, Positron, 0103 physical sciences, High Energy Physics::Experiment, Neutron, Atomic physics, 010306 general physics, Spin-½
Abstract: Results are reported from the HERMES experiment at HERA on a measurement of the neutron spin structure function g1n(x, Q2) in deep inelastic scattering using 27.5 GeV longitudinally polarized positrons incident on a polarized 3He internal gas target. The data cover the kinematic range 0.023
Published: 1997

80. Publisher's Note: Differential photoproduction cross sections of theΣ0(1385),Λ(1405), andΛ(1520)[Phys. Rev. C88, 045201 (2013)]

Author: K. Moriya, R. A. Schumacher, K. P. Adhikari, D. Adikaram, M. Aghasyan, M. J. Amaryan, M. D. Anderson, S. Anefalos Pereira, H. Avakian, J. Ball, N. A. Baltzell, M. Battaglieri, V. Batourine, I. Bedlinskiy, M. Bellis, R. P. Bennett, A. S. Biselli, J. Bono, S. Boiarinov, W. J. Briscoe, W. K. Brooks, V. D. Burkert, D. S. Carman, A. Celentano, S. Chandavar, P. Collins, M. Contalbrigo, O. Cortes, V. Crede, A. D’Angelo, N. Dashyan, R. De Vita, E. De Sanctis, A. Deur, B. Dey, C. Djalali, D. Doughty, M. Dugger, R. Dupre, H. Egiyan, L. El Fassi, P. Eugenio, G. Fedotov, S. Fegan, R. Fersch, J. A. Fleming, N. Gevorgyan, G. P. Gilfoyle, K. L. Giovanetti, F. X. Girod, J. T. Goetz, W. Gohn, E. Golovatch, R. W. Gothe, K. A. Griffioen, M. Guidal, N. Guler, L. Guo, H. Hakobyan, C. Hanretty, D. Heddle, K. Hicks, D. Ho, M. Holtrop, Y. Ilieva, D. G. Ireland, B. S. Ishkhanov, E. L. Isupov, H. S. Jo, K. Joo, D. Keller, M. Khandaker, A. Klein, F. J. Klein, S. Koirala, A. Kubarovsky, V. Kubarovsky, S. V. Kuleshov, S. Lewis, K. Livingston, H. Y. Lu, I. J. D. MacGregor, D. Martinez, M. Mayer, M. McCracken, B. McKinnon, M. D. Mestayer, C. A. Meyer, T. Mineeva, M. Mirazita, V. Mokeev, R. A. Montgomery, H. Moutarde, E. Munevar, C. Munoz Camacho, P. Nadel-Turonski, R. Nasseripour, C. S. Nepali, S. Niccolai, G. Niculescu, I. Niculescu, M. Osipenko, A. I. Ostrovidov, L. L. Pappalardo, R. Paremuzyan, K. Park, S. Park, E. Pasyuk, E. Phelps, J. J. Phillips, S. Pisano, O. Pogorelko, S. Pozdniakov, J. W. Price, S. Procureur, D. Protopopescu, A. J. R. Puckett, B. A. Raue, D. Rimal, M. Ripani, B. G. Ritchie, G. Rosner, P. Rossi, F. Sabatié, M. S. Saini, C. Salgado, D. Schott, E. Seder, H. Seraydaryan, Y. G. Sharabian, G. D. Smith, D. I. Sober, D. Sokhan, S. Stepanyan, P. Stoler, S. Strauch, M. Taiuti, W. Tang, C. E. Taylor, S. Taylor, Y. Tian, S. Tkachenko, M. Ungaro, B. Vernarsky, M. F. Vineyard, H. Voskanyan, E. Voutier, N. K. Walford, D. P. Watts, L. B. Weinstein, M. Williams, M. H. Wood, N. Zachariou, L. Zana, J. Zhang, Z. W. Zhao, and I. Zonta
Subjects: Physics, Nuclear and High Energy Physics, Differential (mathematics), Mathematical physics
Published: 2013

81. Differential photoproduction cross sections of theΣ0(1385),Λ(1405), andΛ(1520)

Author: H. Y. Lu, Jie Zhang, H. Avakian, M. F. Vineyard, R. Fersch, N. Guler, M. J. Amaryan, N. K. Walford, S. Fegan, H. Voskanyan, H. Seraydaryan, J. P. Ball, D. S. Carman, I. Zonta, R. De Vita, W. J. Briscoe, E. Pasyuk, E. Voutier, Friedrich Klein, H. Moutarde, I. Niculescu, Brian Raue, K. L. Giovanetti, Y. G. Sharabian, A. Kubarovsky, S. Anefalos Pereira, Larry Weinstein, A. Deur, R. A. Schumacher, F. Sabatié, B. Vernarsky, V. P. Kubarovsky, D. Doughty, S. Tkachenko, P. Eugenio, L. Guo, G. Niculescu, Andrew Puckett, Martin K. Mayer, O. Pogorelko, D. Adikaram, W. K. Brooks, D. Heddle, D. Protopopescu, M. Guidal, S. Pozdniakov, S. Park, E. Munevar, S. Niccolai, S. Chandavar, E. Seder, B. S. Ishkhanov, E. De Sanctis, C. E. Taylor, J. J. Phillips, P. Rossi, M. S. Saini, Michael Wood, M. Aghasyan, Z. W. Zhao, David M. Keller, D. I. Sober, M. Holtrop, S. Stepanyan, I. J. D. MacGregor, H. Hakobyan, D. Ho, V. Crede, Y. Ilieva, Kei Moriya, C. A. Meyer, G. V. Fedotov, E. Golovatch, C. Hanretty, Nicholas Zachariou, M. Khandaker, M. Contalbrigo, C. S. Nepali, Luciano Pappalardo, S. Strauch, D. P. Watts, R. A. Montgomery, S. Lewis, M. D. Mestayer, B. McKinnon, J. A. Fleming, O. Cortes, T. Mineeva, D. Rimal, P. Stoler, M. Taiuti, E. L. Isupov, W. Tang, J. Bono, P. Nadel-Turonski, Ye Tian, Michael L. Williams, K. P. Adhikari, B. Dey, M. Osipenko, Diane Schott, G. Rosner, R. Nasseripour, A. I. Ostrovidov, K. Park, S. Boiarinov, K. Hicks, I. Bedlinskiy, D. G. Ireland, D. Martinez, Volker D. Burkert, A. S. Biselli, M. Mirazita, Barry Ritchie, F. X. Girod, A. Celentano, R. W. Gothe, Sergey Kuleshov, J. T. Goetz, V. Mokeev, W. Gohn, N. Gevorgyan, V. Batourine, C. Djalali, J. W. Price, S. Koirala, R. Paremuzyan, Lorenzo Zana, E. Phelps, S. Pisano, H. S. Jo, Gerard Gilfoyle, C. Salgado, D. Sokhan, Hovanes Egiyan, C. Munoz Camacho, R. P. Bennett, P. Collins, N. A. Baltzell, K. A. Griffioen, S. Taylor, Avraham Klein, M. Ungaro, M. Ripani, Michael Dugger, K. Joo, M. Bellis, R. Dupre, M. Battaglieri, S. Procureur, George Davey Smith, A. D'Angelo, L. El Fassi, M. E. McCracken, K. Livingston, and N. Dashyan
Subjects: Physics, Nuclear and High Energy Physics, Particle physics, Current (mathematics), 010308 nuclear & particles physics, Theoretical models, Hyperon, Sigma, Lambda, 01 natural sciences, Nuclear physics, Isospin, 0103 physical sciences, Effective lagrangian, High Energy Physics::Experiment, Nuclear Experiment, 010306 general physics, Differential (mathematics)
Abstract: We report the exclusive photoproduction cross sections for the Sigma(1385), Lambda(1405), and Lambda(1520) in the reactions gamma + p -> K+ + Y* using the CLAS detector for energies from near the respective production thresholds up to a center-of-mass energy W of 2.85 GeV. The differential cross sections are integrated to give the total exclusive cross sections for each hyperon. Comparisons are made to current theoretical models based on the effective Lagrangian approach and fitted to previous data. The accuracy of these models is seen to vary widely. The cross sections for the Lambda(1405) region are strikingly different for the Sigma+pi-, Sigma0 pi0, and Sigma- pi+ decay channels, indicating the effect of isospin interference, especially at W values close to the threshold.
Published: 2013

82. Demonstration of a novel technique to measure two-photon exchange effects in elastice±pscattering

Author: R. P. Bennett, P. Eugenio, J. Bono, N. A. Baltzell, K. A. Griffioen, Andrew Puckett, S. Strauch, Martin K. Mayer, H. Y. Lu, M. MacCormick, A. Deur, R. Paremuzyan, M. Battaglieri, M. S. Saini, I. Zonta, H. Egiyan, Gerard Gilfoyle, R. De Vita, D. Sokhan, I. Niculescu, J. T. Goetz, B. McKinnon, P. Collins, S. Tkachenko, E. Seder, M. Mirazita, E. Phelps, S. Anefalos Pereira, L. Guo, Z. W. Zhao, G. Rosner, R. Nasseripour, N. Gevorgyan, S. Chandavar, W. Gohn, D. Ho, V. Batourine, Kei Moriya, C. E. Taylor, William Brooks, S. E. Kuhn, O. Cortes, V. P. Kubarovsky, G. V. Fedotov, E. L. Isupov, Ye Tian, J. A. Fleming, S. Park, J. Zhang, Andrei Afanasev, E. De Sanctis, E. Golovatch, O. Pogorelko, S. Boiarinov, A. Celentano, R. Dupre, R. W. Gothe, P. Rossi, M. Aghasyan, R. A. Schumacher, C. Munoz Camacho, K. P. Adhikari, Lorenzo Zana, H. Avakian, J. Lachniet, D. I. Sober, H. Hakobyan, C. Hanretty, S. Procureur, N. Harrison, Maryam Moteabbed, E. Munevar, B. S. Ishkhanov, V. Crede, C. Salgado, N. K. Walford, M. Ungaro, H. Voskanyan, R. A. Montgomery, Chaden Djalali, Elton Smith, M. R. Niroula, H. Seraydaryan, Y. G. Sharabian, A. Kubarovsky, S. Lewis, F. Sabatié, S. Stepanyan, G. Niculescu, W. J. Briscoe, I. Bedlinskiy, H. S. Jo, K. Joo, T. Mineeva, J. J. Phillips, George Davey Smith, Dustin Keller, S. Fegan, S. Pisano, I. J. D. MacGregor, S. Koirala, A. Kim, W. Tang, Michael Wood, M. Contalbrigo, A. D'Angelo, M. Osipenko, K. Hafidi, Victor Mokeev, K. Hicks, D. Martinez, F. X. Girod, N. Dashyan, L. El Fassi, J. W. Price, D. Protopopescu, P. Nadel-Turonski, S. Pozdniakov, E. Voutier, Diane Schott, A. I. Ostrovidov, K. Park, D. G. Ireland, N. Guler, Volker D. Burkert, A. S. Biselli, Y. Ilieva, Nicholas Zachariou, J. P. Ball, D. Rimal, R. G. Fersch, D. S. Carman, P. L. Cole, D. Doughty, S. Niccolai, D. Heddle, M. J. Amaryan, H. Moutarde, K. L. Giovanetti, Sergey Kuleshov, D. Adikaram, Larry Weinstein, M. Guidal, M. Holtrop, Luciano Pappalardo, M. Khandaker, C. E. Hyde, Friedrich Klein, J. Arrington, Brian Raue, and M. Ripani
Subjects: Elastic scattering, Physics, Nuclear and High Energy Physics, Photon, Proton, 010308 nuclear & particles physics, Scattering, Electron, 01 natural sciences, Nuclear physics, Positron, 0103 physical sciences, Physics::Accelerator Physics, High Energy Physics::Experiment, Atomic physics, 010306 general physics, Electron scattering, Beam (structure)
Abstract: Background: The discrepancy between proton electromagnetic form factors extracted using unpolarized and polarized scattering data is believed to be a consequence of two-photon exchange (TPE) effects. However, the calculations of TPE corrections have significant model dependence, and there is limited direct experimental evidence for such corrections. Purpose: The TPE contributions depend on the sign of the lepton charge in e(+/-)p scattering, but the luminosities of secondary positron beams limited past measurement at large scattering angles, where the TPE effects are believe to be most significant. We present the results of a new experimental technique for making direct e(+/-)p comparisons, which has the potential to make precise measurements over a broad range in Q(2) and scattering angles. Methods: We use the Jefferson Laboratory electron beam and the Hall B photon tagger to generate a clean but untagged photon beam. The photon beam impinges on a converter foil to generate a mixed beam of electrons, positrons, and photons. A chicane is used to separate and recombine the electron and positron beams while the photon beam is stopped by a photon blocker. This provides a combined electron and positron beam, with energies from 0.5 to 3.2 GeV, which impinges on a liquid hydrogen target. The large acceptance CLAS detector is used to identify and reconstruct elastic scattering events, determining both the initial lepton energy and the sign of the scattered lepton. Results: The data were collected in two days with a primary electron beam energy of only 3.3 GeV, limiting the data from this run to smaller values of Q(2) and scattering angle. Nonetheless, this measurement yields a data sample for e(+/-)p with statistics comparable to those of the best previous measurements. We have shown that we can cleanly identify elastic scattering events and correct for the difference in acceptance for electron and positron scattering. Because we ran with only one polarity for the chicane, we are unable to study the difference between the incoming electron and positron beams. This systematic effect leads to the largest uncertainty in the final ratio of positron to electron scattering: R = 1.027 +/- 0.005 +/- 0.05 for = 0.206 GeV2 and 0.830
Published: 2013

83. Separated structure functions for exclusiveK+ΛandK+Σ0electroproduction at 5.5 GeV measured with CLAS

Author: N. A. Baltzell, E. De Sanctis, M. Aghasyan, H. Y. Lu, M. D. Mestayer, S. Strauch, G. Charles, D. I. Sober, O. Cortes, E. L. Isupov, Ye Tian, S. Procureur, Y. Prok, M. Ungaro, Eugene Pasyuk, D. P. Watts, P. Stoler, F. X. Girod, S. Boiarinov, M. Anghinolfi, H. Seraydaryan, M. Contalbrigo, V. P. Kubarovsky, D. Doughty, C. Hanretty, A. Fradi, Y. G. Sharabian, M. Ripani, I. Niculescu, R. De Vita, A. El Alaoui, V. Mokeev, O. Pogorelko, K. Joo, J. T. Goetz, K. Hicks, D. Heddle, J. W. Price, S. Anefalos Pereira, M. Y. Gabrielyan, Andrew Puckett, Martin K. Mayer, Dustin Keller, C. Munoz Camacho, J. P. Ball, S. Lewis, R. A. Schumacher, D. S. Carman, S. Pisano, B. McKinnon, M. S. Saini, S. Koirala, Sergey Kuleshov, R. Dupre, Nicholas Zachariou, D. Rimal, P. L. Cole, C. Djalali, Michael Wood, I. Bedlinskiy, S. Chandavar, M. Mirazita, E. Phelps, K. Hafidi, S. Park, M. Battaglieri, N. Gevorgyan, George Davey Smith, S. Tkachenko, V. Batourine, E. Voutier, E. Seder, L. Guo, Lorenzo Zana, I. Zonta, Diane Schott, H. Avakian, A. I. Ostrovidov, K. Park, R. Nasseripour, K. Livingston, J. A. Fleming, W. Kim, N. K. Walford, T. Mineeva, N. Harrison, A. D'Angelo, S. Stepanyan, H. Hakobyan, H. S. Jo, E. Munevar, C. A. Meyer, H. Voskanyan, R. Paremuzyan, G. V. Fedotov, I. I. Strakovsky, B. Guegan, Avraham Klein, K. A. Griffioen, D. G. Ireland, Y. Ilieva, Jie Zhang, G. Niculescu, S. Fegan, W. J. Briscoe, J. Bono, P. Nadel-Turonski, V. Crede, C. Salgado, P. Eugenio, J. J. Phillips, L. El Fassi, A. Deur, M. Taiuti, K. P. Adhikari, D. Sokhan, S. Niccolai, William Brooks, Volker D. Burkert, A. S. Biselli, R. Fersch, Y. Mao, S. S. Stepanyan, P. Khetarpal, I. J. D. MacGregor, N. Dashyan, C. S. Nepali, C. E. Taylor, R. A. Montgomery, N. A. Saylor, A. Trivedi, N. D. Kvaltine, H. Baghdasaryan, W. Tang, P. Rossi, A. Celentano, R. W. Gothe, Z. W. Zhao, A. Kubarovsky, M. Osipenko, B. Vernarsky, D. Ho, D. Adikaram, M. Khandaker, M. Guidal, B. S. Ishkhanov, D. Protopopescu, D. Martinez, S. Pozdniakov, W. Gohn, M. Holtrop, Luciano Pappalardo, M. J. Amaryan, H. Moutarde, K. L. Giovanetti, G. Rosner, Larry Weinstein, F. Sabatié, G. Ricco, Friedrich Klein, Brian Raue, and A. Kim
Subjects: Physics, Nuclear and High Energy Physics, Particle physics, Meson, 010308 nuclear & particles physics, Structure function, Hyperon, Sigma, Polarization (waves), Lambda, 01 natural sciences, Baryon, Nuclear physics, Pion, 0103 physical sciences, High Energy Physics::Experiment, Nuclear Experiment, 010306 general physics
Abstract: We report measurements of the exclusive electroproduction of K{sup +}{Lambda} and K{sup +}{Sigma}{sup 0} final states from an unpolarized proton target using the CLAS detector at the Thomas Jefferson National Accelerator Facility. The separated structure functions {sigma}{sub U}, {sigma}{sub LT}, {sigma}{sub TT}, and {sigma}{sub LT'} were extracted from the {Phi}-dependent differential cross sections acquired with a longitudinally polarized 5.499~GeV electron beam. The data span a broad range of momentum transfers Q{sup 2} from 1.4 to 3.9 GeV{sup 2}, invariant energy W from threshold to 2.6 GeV, and nearly the full center-of-mass angular range of the kaon. The separated structure functions provide an unprecedented data sample, which in conjunction with other meson photo- and electroproduction data, will help to constrain the higher-level analyses being performed to search for missing baryon resonances.
Published: 2013

84. Deep exclusive π+ electroproduction off the proton at CLAS

Author: K. Park, M. Guidal, R. W. Gothe, J. M. Laget, M. Garçon, K. P. Adhikari, M. Aghasyan, M. J. Amaryan, M. Anghinolfi, H. Avakian, H. Baghdasaryan, J. Ball, N. A. Baltzell, M. Battaglieri, I. Bedlinsky, R. P. Bennett, A. S. Biselli, C. Bookwalter, S. Boiarinov, W. J. Briscoe, W. K. Brooks, V. D. Burkert, D. S. Carman, A. Celentano, S. Chandavar, G. Charles, M. Contalbrigo, V. Crede, A. D’Angelo, A. Daniel, N. Dashyan, R. De Vita, E. De Sanctis, A. Deur, C. Djalali, G. E. Dodge, D. Doughty, R. Dupre, H. Egiyan, A. El Alaoui, L. El Fassi, P. Eugenio, G. Fedotov, S. Fegan, J. A. Fleming, T. A. Forest, A. Fradi, N. Gevorgyan, G. P. Gilfoyle, K. L. Giovanetti, F. X. Girod, W. Gohn, E. Golovatch, L. Graham, K. A. Griffioen, B. Guegan, L. Guo, K. Hafidi, H. Hakobyan, C. Hanretty, D. Heddle, K. Hicks, D. Ho, M. Holtrop, Y. Ilieva, D. G. Ireland, B. S. Ishkhanov, D. Jenkins, H. S. Jo, D. Keller, M. Khandaker, P. Khetarpal, A. Kim, W. Kim, F. J. Klein, S. Koirala, A. Kubarovsky, V. Kubarovsky, S. E. Kuhn, S. V. Kuleshov, K. Livingston, H. Y. Lu, I. J. D. MacGregor, Y. Mao, N. Markov, D. Martinez, M. Mayer, B. McKinnon, C. A. Meyer, T. Mineeva, M. Mirazita, V. Mokeev, H. Moutarde, E. Munevar, C. Munoz Camacho, P. Nadel-Turonski, C. S. Nepali, S. Niccolai, G. Niculescu, I. Niculescu, M. Osipenko, A. I. Ostrovidov, L. L. Pappalardo, R. Paremuzyan, S. Park, E. Pasyuk, S. Anefalos Pereira, E. Phelps, S. Pisano, O. Pogorelko, S. Pozdniakov, J. W. Price, S. Procureur, D. Protopopescu, A. J. R. Puckett, B. A. Raue, G. Ricco, D. Rimal, M. Ripani, G. Rosner, P. Rossi, F. Sabatié, M. S. Saini, C. Salgado, D. Schott, R. A. Schumacher, E. Seder, H. Seraydaryan, Y. G. Sharabian, E. S. Smith, G. D. Smith, D. I. Sober, D. Sokhan, S. S. Stepanyan, P. Stoler, I. I. Strakovsky, S. Strauch, M. Taiuti, W. Tang, C. E. Taylor, Ye Tian, S. Tkachenko, A. Trivedi, M. Ungaro, B. Vernarsky, H. Voskanyan, E. Voutier, N. K. Walford, D. P. Watts, L. B. Weinstein, D. P. Weygand, M. H. Wood, N. Zachariou, J. Zhang, Z. W. Zhao, I. Zonta, Département de Physique Nucléaire (ex SPhN) (DPHN), Institut de Recherches sur les lois Fondamentales de l'Univers (IRFU), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, Institut de Physique Nucléaire d'Orsay (IPNO), Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11), Laboratoire de Physique Subatomique et de Cosmologie (LPSC), Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Institut Polytechnique de Grenoble - Grenoble Institute of Technology-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Joseph Fourier - Grenoble 1 (UJF)-Centre National de la Recherche Scientifique (CNRS), CLAS, Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), and Université Joseph Fourier - Grenoble 1 (UJF)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Institut Polytechnique de Grenoble - Grenoble Institute of Technology-Centre National de la Recherche Scientifique (CNRS)
Subjects: Particle physics, Nuclear and High Energy Physics, Hadron, Theoretical models, Parton, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 01 natural sciences, Settore FIS/04 - Fisica Nucleare e Subnucleare, SCALING LAWS, 0103 physical sciences, VIRTUAL COMPTON-SCATTERING, PION FORM-FACTOR, CROSS-SECTION, HIGH-ENERGIES, PHOTOPRODUCTION, DEUTERON, MESONS, PHOTODISINTEGRATION, MOMENTUM, 010306 general physics, Nuclear Experiment, Physics, 010308 nuclear & particles physics, Scattering, Phenomenology (particle physics)
Abstract: The exclusive electroproduction of $\pi^+$ above the resonance region was studied using the $\rm{CEBAF}$ Large Acceptance Spectrometer ($\rm{CLAS}$) at Jefferson Laboratory by scattering a 6 GeV continuous electron beam off a hydrogen target. The large acceptance and good resolution of $\rm{CLAS}$, together with the high luminosity, allowed us to measure the cross section for the $\gamma^* p \to n \pi^+$ process in 140 ($Q^2$, $x_B$, $t$) bins: $0.16, Comment: 18pages, 21figures,2tables
Published: 2013

85. Near-threshold neutral pion electroproduction at high momentum transfers and generalized form factors

Author: S. Tkachenko, L. Guo, E. De Sanctis, N. Harrison, M. Aghasyan, D. I. Sober, I. Zonta, A. Celentano, R. W. Gothe, F. X. Girod, G. Charles, F. Sabatié, R. A. Schumacher, W. Tang, P. Stoler, C. E. Hyde, M. Osipenko, J. T. Goetz, N. D. Kvaltine, K. Hicks, David M. Keller, M. Ungaro, D. Martinez, M. Ripani, M. Contalbrigo, W. Gohn, S. Stepanyan, T. Mineeva, P. Eugenio, C. E. Taylor, Andrew Puckett, E. Munevar, Martin K. Mayer, R. De Vita, E. Seder, H. Y. Lu, Michael Wood, K. Hafidi, W. Kim, E. Golovatch, G. Niculescu, M. Taiuti, M. S. Saini, K. Joo, R. Nasseripour, G. Ricco, P. Khetarpal, S. Niccolai, C. A. Meyer, I. Niculescu, E. L. Isupov, S. Anefalos Pereira, G. Rosner, G. V. Fedotov, S. Lewis, K. A. Griffioen, N. A. Saylor, H. Avakian, Y. Mao, S. Boiarinov, I. I. Strakovsky, K. P. Adhikari, H. Hakobyan, D. P. Weygand, R. Dupre, C. Hanretty, J. W. Price, J. Bono, M. Battaglieri, Michael Dugger, R. G. Fersch, N. K. Walford, A. Deur, Friedrich Klein, J. J. Phillips, P. Nadel-Turonski, H. Voskanyan, B. Vernarsky, Brian Raue, W. K. Brooks, I. J. D. MacGregor, S. Park, H. S. Jo, P. L. Cole, W. J. Briscoe, E. Pasyuk, George Davey Smith, Z. W. Zhao, C. Salgado, B. S. Ishkhanov, J. A. Fleming, D. Ho, I. Bedlinskiy, P. Rossi, A. D'Angelo, L. El Fassi, M. Anghinolfi, H. Seraydaryan, V. Crede, V. P. Kubarovsky, S. Koirala, C. Djalali, O. Pogorelko, Y. G. Sharabian, Victor Mokeev, R. A. Montgomery, S. Procureur, E. Phelps, Diane Schott, A. I. Ostrovidov, K. Park, D. G. Ireland, Volker D. Burkert, A. S. Biselli, A. Fradi, S. Pisano, A. Kim, N. A. Baltzell, M. Khandaker, D. Doughty, M. J. Amaryan, H. Moutarde, K. L. Giovanetti, Larry Weinstein, S. S. Stepanyan, A. Kubarovsky, D. Adikaram, M. Guidal, M. Holtrop, Luciano Pappalardo, Sergey Kuleshov, R. Paremuzyan, Gerard Gilfoyle, D. Sokhan, C. Munoz Camacho, B. McKinnon, M. Mirazita, N. Gevorgyan, V. Batourine, A. El Alaoui, Y. Ilieva, Nicholas Zachariou, D. Rimal, K. Livingston, Jie Zhang, Inna Aznauryan, S. Strauch, H. Egiyan, D. Protopopescu, S. Pozdniakov, M. Garçon, M. Y. Gabrielyan, N. Dashyan, H. Baghdasaryan, B. Guegan, S. Fegan, J. P. Ball, D. S. Carman, E. Voutier, Département de Physique Nucléaire (ex SPhN) (DPHN), Institut de Recherches sur les lois Fondamentales de l'Univers (IRFU), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, Laboratoire de Physique Subatomique et de Cosmologie (LPSC), Université Joseph Fourier - Grenoble 1 (UJF)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Institut Polytechnique de Grenoble - Grenoble Institute of Technology-Centre National de la Recherche Scientifique (CNRS), CLAS, and Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Institut Polytechnique de Grenoble - Grenoble Institute of Technology-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Joseph Fourier - Grenoble 1 (UJF)-Centre National de la Recherche Scientifique (CNRS)
Subjects: Physics, Nuclear and High Energy Physics, Particle physics, Proton, 010308 nuclear & particles physics, Structure function, FOS: Physical sciences, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 01 natural sciences, High momentum, Settore FIS/04 - Fisica Nucleare e Subnucleare, Nuclear physics, Near threshold, Pion, CLAS, 0103 physical sciences, Nuclear Experiment (nucl-ex), 010306 general physics, Nuclear Experiment, SYSTEM
Abstract: We report the measurement of near threshold neutral pion electroproduction cross sections and the extraction of the associated structure functions on the proton in the kinematic range $Q^2$ from 2 to 4.5 GeV$^2$ and $W$ from 1.08 to 1.16 GeV. These measurements allow us to access the dominant pion-nucleon s-wave multipoles $E_{0+}$ and $S_{0+}$ in the near-threshold region. In the light-cone sum-rule framework (LCSR), these multipoles are related to the generalized form factors $G_1^{\pi^0 p}(Q^2)$ and $G_2^{\pi^0 p}(Q^2)$. The data are compared to these generalized form factors and the results for $G_1^{\pi^0 p}(Q^2)$ are found to be in good agreement with the LCSR predictions, but the level of agreement with $G_2^{\pi^0 p}(Q^2)$ is poor., Comment: 17 pages, 18 figures, Journal article (Physical Review C)
Published: 2013

86. Performance of F101 radiation resistant lead glass shower counters

Author: M. Nupieri, V. Giourdjian, R. Avakian, A. R. Reolon, A. Avetissian, B. W. Filippone, M. Amarian, G. P. Capitani, M. Kolstein, A. Airapetian, N. Akopov, M. Doets, Alessandra Fantoni, P. Galumian, Valeria Muccifora, S. Taroian, A. Simon, Th. Henkes, V. Garibian, E. De Sanctis, P. Rossi, Nicola Bianchi, J. F. J. van den Brand, R. Mozzetti, B. Bray, H. Avakian, A. Lung, and (Astro)-Particles Physics
Subjects: Physics, Nuclear and High Energy Physics, Range (particle radiation), Radiation resistant, business.industry, Astrophysics::High Energy Astrophysical Phenomena, Resolution (electron density), Linearity, Nuclear physics, Lead glass, Optics, DESIGN, ELECTROMAGNETIC CALORIMETER, visual_art, visual_art.visual_art_medium, SPECTROMETER, High Energy Physics::Experiment, business, Instrumentation, Cherenkov radiation
Abstract: The performance of F101 lead glass as a Cherenkov radiation material was studied. A 3 x 3 array of 9 x 9 cm(2) and 50 cm length counters showed an energy resolution of approximate to 5.0%/root E(GeV), good linearity in the energy range from 1 to 25 GeV and pi(-)/e rejection of approximate to 4 x 10(-4).
Published: 1996

87. Experimental study of theP11(1440)andD13(1520)resonances from the CLAS data onep→e′π+π−p′

Author: M. Contalbrigo, I. Zonta, W. Kim, Friedrich Klein, I. I. Strakovsky, M. Guidal, S. Tkachenko, Brian Raue, P. Khetarpal, L. Guo, A. Deur, M. Holtrop, W. K. Brooks, C. S. Nepali, A. Daniel, A. Kim, N. A. Baltzell, H. Moutarde, Luciano Pappalardo, P. Eugenio, C. E. Taylor, J. Ball, V. P. Kubarovsky, A. Celentano, R. W. Gothe, S. S. Stepanyan, A. El Alaoui, Y. Ilieva, V. Crede, O. Pogorelko, E. Golovatch, P. Stoler, H. Hakobyan, L. C. Smith, Nicholas Zachariou, S. Strauch, C. Hanretty, D. Sokhan, M. Anghinolfi, K. Hicks, B. S. Ishkhanov, S. Koirala, H. Seraydaryan, A. Kubarovsky, D. Rimal, W. Tang, Y. G. Sharabian, S. Procureur, K. L. Giovanetti, Z. W. Zhao, A Fradi, H. Y. Lu, I. Bedlinskiy, Michael Wood, E. Seder, H. S. Jo, K. Hafidi, B. Guegan, D. Ho, M. Ungaro, E. De Sanctis, Martin K. Mayer, M. Ripani, K. A. Griffioen, Latifa Elouadrhiri, M. Aghasyan, G. Charles, D. Martinez, Sergey Kuleshov, H. Avakian, D. I. Sober, R. Paremuzyan, C. A. Meyer, Y. Mao, M. S. Saini, G. V. Fedotov, A. Trivedi, I. J. D. MacGregor, B. McKinnon, S. Park, R. A. Schumacher, N. K. Walford, H. Voskanyan, W. J. Briscoe, N. Markov, M. Khandaker, K. P. Adhikari, S. Pisano, K. Livingston, P. Rossi, E. Pasyuk, L. Graham, M. Mirazita, R. Dupre, David M. Keller, M. Battaglieri, T. Mineeva, V. Batourine, A. I. Ostrovidov, R. De Vita, F. X. Girod, K. Park, D. Doughty, S. Stepanyan, D. G. Ireland, E. Munevar, K. Joo, Avraham Klein, E. L. Isupov, D. Protopopescu, P. L. Cole, S. Pozdniakov, Volker D. Burkert, A. S. Biselli, Ye Tian, F. Sabatié, W. Gohn, S. Anefalos Pereira, J. W. Price, D. Schott, S. Boiarinov, George Davey Smith, Michael Vineyard, A. D'Angelo, P. Nadel-Turonski, C. Salgado, Victor Mokeev, C. Djalali, N. D. Kvaltine, D. S. Carman, E. Voutier, G. Ricco, G. Rosner, S. Fegan, C. Bookwalter, N. Dashyan, and H. Baghdasaryan
Subjects: Physics, Nuclear and High Energy Physics, Particle physics, Unitarity, Proton, 010308 nuclear & particles physics, Branching fraction, Hadron, 01 natural sciences, Helicity, Excited state, 0103 physical sciences, 010306 general physics, Ground state, Ansatz
Abstract: The transition helicity amplitudes from the proton ground state to the $$P_{11}(1440)$$ and $$D_{13}(1520)$$ excited states ($$\gamma_{v}pN^*$$ electrocouplings) were determined from the analysis of nine independent one-fold differential $$\pi^{+} \pi^{-} p$$ electroproduction cross sections off a proton target, taken with CLAS at photon virtualities 0.25\enskip {\rm GeV$$^{2}$$} $
Published: 2012

88. Measurement of Exclusiveπ0Electroproduction Structure Functions and their Relationship to Transverse Generalized Parton Distributions

Author: A. Kim, R. A. Schumacher, D. Doughty, D. Heddle, L. Graham, F. X. Girod, V. Mokeev, K. A. Griffioen, Y. Mao, S. Strauch, T. A. Forest, P. Nadel-Turonski, D. P. Watts, H. Egiyan, R. P. Bennett, S. Stepanyan, E. Munevar, M. Ungaro, A. V. Vlassov, I. Zonta, Eugene Pasyuk, A. I. Ostrovidov, K. Park, S. Tkachenko, D. G. Ireland, L. Guo, A. El Alaoui, Y. Ilieva, Volker D. Burkert, C. Munoz Camacho, Andrew Puckett, Martin K. Mayer, Nicholas Zachariou, A. S. Biselli, R. De Vita, W. Gohn, K. Joo, M. Khandaker, M. S. Saini, G. Ricco, C. E. Taylor, B. McKinnon, D. Rimal, W. Tang, E. Seder, I. J. D. MacGregor, M. Osipenko, S. Procureur, G. Charles, S. Anefalos Pereira, M. J. Amaryan, M. Mirazita, N. Markov, V. Crede, Latifa Elouadrhiri, S. Pisano, K. Livingston, N. Gevorgyan, N. A. Saylor, S. E. Kuhn, D. Martinez, B. Guegan, C. A. Meyer, A. Celentano, R. W. Gothe, J. A. Fleming, Friedrich Klein, G. V. Fedotov, H. Moutarde, M. Ripani, S. Fegan, Jie Zhang, Brian Raue, R. Paremuzyan, W. Kim, K. L. Giovanetti, G. Niculescu, F. Sabatié, N. D. Kvaltine, E. De Sanctis, H. Hakobyan, C. Djalali, R. Dupre, Larry Weinstein, M. Contalbrigo, M. Battaglieri, C. Hanretty, M. Aghasyan, A. Deur, K. P. Adhikari, D. I. Sober, M. Taiuti, David M. Keller, D. P. Weygand, W. K. Brooks, H. S. Jo, D. Sokhan, C. Bookwalter, P. Stoler, J. W. Price, Michael Wood, I. Bedlinskiy, K. Hafidi, K. Hicks, D. Protopopescu, S. Pozdniakov, M. Garçon, E. Voutier, S. Koirala, G. Rosner, S. Chandavar, E. Phelps, S. Park, N. Dashyan, P. Rossi, E. L. Isupov, V. P. Kubarovsky, A. Kubarovsky, Ye Tian, George Davey Smith, A. D'Angelo, O. Pogorelko, L. El Fassi, H. Avakian, H. Baghdasaryan, S. Boiarinov, M. Guidal, M. Holtrop, A. Daniel, Luciano Pappalardo, N. K. Walford, H. Voskanyan, W. J. Briscoe, J. P. Ball, Y. Prok, D. S. Carman, S. Niccolai, B. S. Ishkhanov, Sergey Kuleshov, H. Y. Lu, P. Khetarpal, N. A. Baltzell, A. Fradi, I. Niculescu, P. Eugenio, D. Schott, T. Mineeva, C. Salgado, Z. W. Zhao, M. F. Vineyard, M. Anghinolfi, H. Seraydaryan, and Y. G. Sharabian
Subjects: Physics, Particle physics, 010308 nuclear & particles physics, Structure function, General Physics and Astronomy, Sigma, Parton, 01 natural sciences, Helicity, Transverse plane, 0103 physical sciences, Sensitivity (control systems), 010306 general physics, Nucleon, Phenomenology (particle physics)
Abstract: Exclusive $$\pi^0$$ electroproduction at a beam energy of 5.75 GeV has been measured with the Jefferson Lab CLAS spectrometer. Differential cross sections were measured at more than 1800 kinematic values in $Q^2$, $x_B$, $t$, and $$\phi_\pi$$, in the $Q^2$ range from 1.0 to 4.6 GeV$^2$$,\ $$-t$ up to 2 GeV$^2$, and $x_B$ from 0.1 to 0.58. Structure functions $$\sigma_T +\epsilon \sigma_L, \sigma_{TT}$$ and $$\sigma_{LT}$$ were extracted as functions of $t$ for each of 17 combinations of $Q^2$ and $x_B$. The data were compared directly with two handbag-based calculations including both longitudinal and transversity GPDs. Inclusion of only longitudinal GPDs very strongly underestimates $$\sigma_T +\epsilon \sigma_L$$ and fails to account for $$\sigma_{TT}$$ and $$\sigma_{LT}$$, while inclusion of transversity GPDs brings the calculations into substantially better agreement with the data. There is very strong sensitivity to the relative contributions of nucleon helicity flip and helicity non-flip processes. The results confirm that exclusive $$\pi^0$$ electroproduction offers direct experimental access to the transversity GPDs.
Published: 2012

89. Publisher’s Note: Measurement of the NeutronF2Structure Function via Spectator Tagging with CLAS [Phys. Rev. Lett.108, 142001 (2012)]

Author: C. E. Hyde, D. G. Ireland, V. Crede, D. Protopopescu, S. Pozdniakov, H. C. Fenker, D. Adikaram, M. Guidal, Nicholas Kvaltine, G. Niculescu, P. Stoler, Wolodymyr Melnitchouk, G. V. Fedotov, N. Kalantarians, B. Dey, K. Hicks, A. Celentano, R. W. Gothe, M. J. Amaryan, H. Avakian, M. Holtrop, D. P. Weygand, E. De Sanctis, A. Daniel, A. El Alaoui, E. L. Isupov, M. Aghasyan, Luciano Pappalardo, B. Guegan, D. I. Sober, H. Moutarde, M. Contalbrigo, W. Kim, G. Charles, M. Ripani, S. Fegan, K. L. Giovanetti, C. E. Keppel, S. Bültmann, E. Seder, W. J. Briscoe, E. Pasyuk, Larry Weinstein, D. Rimal, Alexei V. Klimenko, D. Doughty, P. Khetarpal, P. E. Bosted, Carlos A. Salgado, Andreas Klein, K. Livingston, M. Ispiryan, Michael Vineyard, D. Heddle, K. P. Adhikari, S. Park, Brian Raue, N. Baillie, Y. Prok, D. S. Carman, B. Zhao, Lorenzo Zana, N. Guler, P. Rossi, H. S. Jo, B. McKinnon, W. Tang, S. E. Kuhn, P. Eugenio, M. Taiuti, R. De Vita, E. Voutier, M. Osipenko, N. Dashyan, D. Branford, V. P. Kubarovsky, M. Khandaker, F. Sabatié, S. S. Jawalkar, S. Niccolai, M. Gabrielyan, N. Gevorgyan, Frank Klein, I. J. D. MacGregor, Sergey Kuleshov, Yordanka Ilieva, M. Anghinolfi, S. Tkachenko, Y. G. Sharabian, S. Anefalos Pereira, Michael Wood, E. V. Hungerford, K. Hafidi, Gerard Gilfoyle, G. Ricco, F. X. Girod, D. Sokhan, M. S. Saini, T. Mineeva, M. E. Christy, Diane Schott, A. I. Ostrovidov, K. Park, Hovhannes Baghdasaryan, S. Strauch, Volker D. Burkert, A. S. Biselli, J. Domingo, A. Fradi, S. Pisano, B. Morrison, C. Djalali, K. A. Griffioen, Dipangkar Dutta, L. Guo, M. Ungaro, J. Arrington, R. A. Schumacher, L. Graham, S. S. Stepanyan, R. Dupre, M. Battaglieri, S. Stepanyan, William Brooks, Rolf Ent, G. E. Dodge, H. Y. Lu, S. Procureur, I. Niculescu, A. Kim, J. Zhang, G. Rosner, Y. Mao, S. Chandavar, J. W. Price, A. Ni, V. Tvaskis, D. P. Watts, H. Egiyan, P. Nadel-Turonski, N. Markov, E. Munevar, P. M. King, E. Golovatch, W. Gohn, L. Elouadrhiri, A. Deur, P. L. Cole, A. D'Angelo, and L. El Fassi
Subjects: Physics, Nuclear physics, Structure function, General Physics and Astronomy, Neutron
Published: 2012

90. Measurement of the Neutron F-2 Structure Function via Spectator Tagging with CLAS

Author: R. Dupre, M. Battaglieri, S. S. Stepanyan, W. Kim, G. Niculescu, B. Zhao, H. Avakian, F. Sabatié, H. C. Fenker, A. I. Ostrovidov, C. E. Hyde, Y. Prok, D. S. Carman, K. Park, D. G. Ireland, Latifa Elouadrhiri, T. Mineeva, M. E. Christy, Volker D. Burkert, A. S. Biselli, S. Tkachenko, S. E. Kuhn, G. V. Fedotov, S. S. Jawalkar, E. Voutier, C. E. Keppel, K. A. Griffioen, D. P. Watts, N. D. Kvaltine, I. J. D. MacGregor, W. J. Briscoe, G. E. Dodge, H. Y. Lu, A. Kim, E. Munevar, Y. Mao, Lorenzo Zana, K. P. Adhikari, D. P. Weygand, M. Khandaker, F. X. Girod, M. Contalbrigo, E. V. Hungerford, R. Ent, Dipangkar Dutta, Sergey Kuleshov, B. Guegan, S. Fegan, Alexei V. Klimenko, Hovanes Egiyan, D. Heddle, W. Tang, H. S. Jo, E. De Sanctis, A. El Alaoui, I. Niculescu, P. Bosted, N. Baillie, M. J. Amaryan, B. A. Raue, J. Domingo, A. Fradi, M. Aghasyan, D. Adikaram, John Arrington, M. Osipenko, M. Guidal, D. I. Sober, P. Khetarpal, M. S. Saini, D. Schott, W. Gohn, R. A. Schumacher, J. W. Price, C. Salgado, G. Charles, N. Dashyan, Wally Melnitchouk, M. Y. Gabrielyan, V. Crede, M. Holtrop, N. Markov, H. Moutarde, S. Pisano, Gerard Gilfoyle, A. Daniel, G. Ricco, G. Rosner, M. Ispiryan, D. Rimal, L. Graham, Michael Wood, K. Hafidi, K. L. Giovanetti, Larry Weinstein, C. Djalali, Luciano Pappalardo, S. Strauch, V. Tvaskis, H. Baghdasaryan, P. Eugenio, D. Doughty, D. Sokhan, R. De Vita, Friedrich Klein, L. Guo, M. Ungaro, M. Taiuti, Eugene Pasyuk, S. Bültmann, S. Chandavar, Andrea Celentano, S. Procureur, A. Deur, N. Kalantarians, R. W. Gothe, K. Livingston, B. McKinnon, S. Anefalos Pereira, E. Seder, M. Anghinolfi, N. Guler, Michael Vineyard, P. Stoler, Y. Ilieva, Jie Zhang, S. Stepanyan, D. Branford, B. Dey, P. M. King, Y. G. Sharabian, K. Hicks, E. Golovatch, Avraham Klein, N. Gevorgyan, E. L. Isupov, S. Niccolai, A. Ni, V. P. Kubarovsky, A. D'Angelo, S. Park, P. Rossi, P. Nadel-Turonski, L. El Fassi, William Brooks, M. Ripani, B. Morrison, P. L. Cole, D. Protopopescu, S. Pozdniakov, Institut de Recherches sur les lois Fondamentales de l'Univers (IRFU), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, Institut de Physique Nucléaire d'Orsay (IPNO), Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11), Laboratoire de Physique Subatomique et de Cosmologie (LPSC), Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Institut Polytechnique de Grenoble - Grenoble Institute of Technology-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Joseph Fourier - Grenoble 1 (UJF)-Centre National de la Recherche Scientifique (CNRS), CLAS, Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), and Université Joseph Fourier - Grenoble 1 (UJF)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Institut Polytechnique de Grenoble - Grenoble Institute of Technology-Centre National de la Recherche Scientifique (CNRS)
Subjects: Proton, Nuclear Theory, FOS: Physical sciences, General Physics and Astronomy, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], NUCLEAR-STRUCTURE, PROTON, 01 natural sciences, Neutron time-of-flight scattering, High Energy Physics - Experiment, Settore FIS/04 - Fisica Nucleare e Subnucleare, Nuclear physics, High Energy Physics - Experiment (hep-ex), DUALITY, 0103 physical sciences, PION, Neutron cross section, [PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex], Neutron, Nuclear Experiment (nucl-ex), 010306 general physics, Nuclear Experiment, Physics, 010308 nuclear & particles physics, Scattering, Momentum transfer, INELASTIC ELECTRON-SCATTERING, STRUCTURE-FUNCTION RATIO, DEUTERON, MODEL, FORM, Deuterium, Nucleon
Abstract: We report on the first measurement of the F2 structure function of the neutron from semi-inclusive scattering of electrons from deuterium, with low-momentum protons detected in the backward hemisphere. Restricting the momentum of the spectator protons to < 100 MeV and their angles to < 100 degrees relative to the momentum transfer allows an interpretation of the process in terms of scattering from nearly on-shell neutrons. The F2n data collected cover the nucleon resonance and deep-inelastic regions over a wide range of Bjorken x for 0.65 < Q2 < 4.52 GeV2, with uncertainties from nuclear corrections estimated to be less than a few percent. These measurements provide the first determination of the neutron to proton structure function ratio F2n/F2p at 0.2 < x < 0.8 with little uncertainty due to nuclear effects., 6 pages, 3 pages
Published: 2012

91. Transverse Momentum Dependent Parton Distribution/Fragmentation Functions at an Electron-Ion Collider

Author: M. Contalbrigo, Matthias Burkardt, J. C. Peng, Jian-Wei Qiu, Minghui Liu, Xin Qian, Daniël Boer, Dipangkar Dutta, Q. J. Ye, Zhong-Bo Kang, Peter Schweitzer, Z. T. Liang, H. Avakian, P. Rossi, X. Zhan, G. Laskaris, A. Prokudin, R. D. McKeown, Leonard Gamberg, J. Soffer, J.P. Chen, N. C. R. Makins, Cynthia Keppel, J. Huang, Y.-H. Zhang, Yujie Qiang, Bernhard Musch, E. Cisbani, J. Zhou, Feng Yuan, Q. Ye, W. Zheng, Donald Crabb, Franco Bradamante, Vincent Sulkosky, Mauro Anselmino, Yi Wang, Zein-Eddine Meziani, Andreas Metz, Haiyan Gao, D. Hasch, M. Huang, and Bo-Wen Xiao
Subjects: Quark, Particle physics, Nuclear and High Energy Physics, media_common.quotation_subject, FRAGMENTATION FUNCTIONS, Hadron, Nuclear Theory, FOS: Physical sciences, Parton, DRELL-YAN PROCESSES, Asymmetry, law.invention, High Energy Physics - Experiment, DEEP-INELASTIC SCATTERING, HARD-SCATTERING, High Energy Physics - Experiment (hep-ex), High Energy Physics - Phenomenology (hep-ph), law, Nuclear Experiment (nucl-ex), Collider, PION ELECTROPRODUCTION, Nuclear Experiment, media_common, Spin-½, Physics, FINAL-STATE INTERACTIONS, High Energy Physics::Phenomenology, SINGLE-SPIN, AZIMUTHAL ASYMMETRIES, Gluon, High Energy Physics - Phenomenology, SPIN PRODUCTION ASYMMETRIES, High Energy Physics::Experiment, HADRON STRUCTURE, Nucleon
Abstract: We present a summary of a recent workshop held at Duke University on Partonic Transverse Momentum in Hadrons: Quark Spin-Orbit Correlations and Quark-Gluon Interactions. The transverse momentum dependent parton distribution functions (TMDs), parton-to-hadron fragmentation functions, and multi-parton correlation functions, were discussed extensively at the Duke workshop. In this paper, we summarize first the theoretical issues concerning the study of partonic structure of hadrons at a future electron-ion collider (EIC) with emphasis on the TMDs. We then present simulation results on experimental studies of TMDs through measurements of single spin asymmetries (SSA) from semi-inclusive deep-inelastic scattering (SIDIS) processes with an EIC, and discuss the requirement of the detector for SIDIS measurements. The dynamics of parton correlations in the nucleon is further explored via a study of SSA in D (`D) production at large transverse momenta with the aim of accessing the unexplored tri-gluon correlation functions. The workshop participants identified the SSA measurements in SIDIS as a golden program to study TMDs in both the sea and valence quark regions and to study the role of gluons, with the Sivers asymmetry measurements as examples. Such measurements will lead to major advancement in our understanding of TMDs in the valence quark region, and more importantly also allow for the investigation of TMDs in the sea quark region along with a study of their evolution., Comment: 44 pages 23 figures, summary of Duke EIC workshop on TMDs accepted by EPJA
Published: 2011
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92. Transverse spin structure of the nucleon through target single-spin asymmetry in semi-inclusive deep-inelastic (e, e’ $ \pi^{\pm}_{}$ ) reaction at Jefferson Lab

Author: A. Prokudin, Y. J. Mao, Mauro Anselmino, C. W. de Jager, X. Jiang, J. P. Chen, B. Q. Ma, Xin Qian, E. Chudakov, Andrei Afanasev, M. Huang, Marc Schlegel, H. Avakian, Z. E. Meziani, L. Zhu, Z. G. Xiao, Paul Souder, G. D. Cates, Jen-Chieh Peng, Yujie Qiang, K. S. Kumar, E. Cisbani, F. Garibaldi, B. T. Hu, Yuzhen Ye, Leonard Gamberg, H. J. Lu, X. M. Li, and Haiyan Gao
Subjects: Quark, Physics, Particle physics, Angular momentum, media_common.quotation_subject, Nuclear Theory, General Physics and Astronomy, Deep inelastic scattering, Asymmetry, Particle identification, Nuclear physics, High Energy Physics - Phenomenology, Pion, High Energy Physics::Experiment, Neutron, Nuclear Experiment, Nucleon, media_common
Abstract: Jefferson Lab (JLab) 12 GeV energy upgrade provides a golden opportunity to perform precision studies of the transverse spin and transverse-momentum-dependent structure in the valence quark region for both the proton and the neutron. In this paper, we focus our discussion on a recently approved experiment on the neutron as an example of the precision studies planned at JLab. The new experiment will perform precision measurements of target Single Spin Asymmetries (SSA) from semi-inclusive electro-production of charged pions from a 40-cm long transversely polarized $^3$He target in Deep-Inelastic-Scattering kinematics using 11 and 8.8 GeV electron beams. This new coincidence experiment in Hall A will employ a newly proposed solenoid spectrometer (SoLID). The large acceptance spectrometer and the high polarized luminosity will provide precise 4-D ($x$, $z$, $P_T$ and $Q^2$) data on the Collins, Sivers, and pretzelocity asymmetries for the neutron through the azimuthal angular dependence. The full 2$\pi$ azimuthal angular coverage in the lab is essential in controlling the systematic uncertainties. The results from this experiment, when combined with the proton Collins asymmetry measurement and the Collins fragmentation function determined from the e$^+$e$^-$ collision data, will allow for a quark flavor separation in order to achieve a determination of the tensor charge of the d quark to a 10% accuracy. The extracted Sivers and pretzelocity asymmetries will provide important information to understand the correlations between the quark orbital angular momentum and the nucleon spin and between the quark spin and nucleon spin., Comment: 23 pages, 13 figures, minor corrections, matches published version
Published: 2011

93. Tensor Correlations Measured inHe3(e,e′pp)n

Author: D. Keller, M. Khandaker, B. McKinnon, G. Rosner, R. W. Gothe, V. Kuznetsov, A. Deur, N. Markov, W. K. Brooks, H. Hakobyan, J. M. Laget, M. Battaglieri, D. J. Tedeschi, I. Bedlinskiy, A. Kim, W. Kim, D. Doughty, P. Nadel-Turonski, R. P. Bennett, D. Protopopescu, Friedrich Klein, R. A. Schumacher, V. P. Kubarovsky, S. Pozdniakov, E. Voutier, E. Munevar, G. Niculescu, O. Pogorelko, S. E. Kuhn, R. Paremuzyan, C. E. Hyde, K. Joo, M. Ripani, Y. Ilieva, A. I. Ostrovidov, P. Khetarpal, S. Strauch, K. Park, Gerard Gilfoyle, G. Ricco, H. Avakian, W. Gohn, D. G. Ireland, B. Zhao, A. El Alaoui, C. S. Nepali, D. Sokhan, S. Bültmann, Volker D. Burkert, A. S. Biselli, M. Anghinolfi, N. D. Kvaltine, H. Seraydaryan, P. Konczykowski, C. Djalali, I. J. D. MacGregor, S. Stepanyan, S. Procureur, J. W. Price, R. Dupre, S. Park, B. L. Berman, J. P. Ball, K. L. Giovanetti, D. S. Carman, R. De Vita, P. Rossi, Martin K. Mayer, Avraham Klein, B. Moreno, Larry Weinstein, W. J. Briscoe, E. Pasyuk, K. A. Griffioen, H. Moutarde, K. Livingston, V. Crede, S. Anefalos Pereira, S. Niccolai, R. Dickson, C. Salgado, G. E. Dodge, H. Y. Lu, E. De Sanctis, B. Morrison, W. Tang, M. Amarian, M. Aghasyan, I. Niculescu, D. I. Sober, S. Fegan, M. Osipenko, J. McAndrew, F. Sabatié, Michael Vineyard, C. Bookwalter, Michael Wood, N. Dashyan, H. Baghdasaryan, C. Hanretty, Victor Mokeev, M. Ungaro, S. Pisano, V. Gyurjyan, P. Eugenio, M. Taiuti, Z. W. Zhao, Sergey Kuleshov, S. S. Stepanyan, M. Guidal, M. Holtrop, A. Daniel, George Davey Smith, C. E. Taylor, A. D'Angelo, L. El Fassi, L. Guo, P. Stoler, B. Dey, K. Hicks, K. Mikhailov, D. P. Watts, H. Egiyan, M. Y. Gabrielyan, Kei Moriya, C. A. Meyer, K. P. Adhikari, and D. P. Weygand
Subjects: Physics, Nuclear reaction, Particle physics, 010308 nuclear & particles physics, Hadron, General Physics and Astronomy, Elementary particle, Few-body systems, 01 natural sciences, Baryon, Nuclear physics, Momentum, Pair production, 0103 physical sciences, Nuclear Experiment, 010306 general physics, Nucleon
Abstract: We have measured the $^{3}\mathrm{He}(e,{e}^{\ensuremath{'}}pp)n$ reaction at an incident energy of 4.7 GeV over a wide kinematic range. We identified spectator correlated $pp$ and $pn$ nucleon pairs by using kinematic cuts and measured their relative and total momentum distributions. This is the first measurement of the ratio of $pp$ to $pn$ pairs as a function of pair total momentum ${p}_{\mathrm{tot}}$. For pair relative momenta between 0.3 and $0.5\text{ }\text{ }\mathrm{GeV}/c$, the ratio is very small at low ${p}_{\mathrm{tot}}$ and rises to approximately 0.5 at large ${p}_{\mathrm{tot}}$. This shows the dominance of tensor over central correlations at this relative momentum.
Published: 2010

94. Quark orbital angular momentum: can we learn about it from GPDs and TMDs?

Author: H. Avakian, Petr Zavada, A.V. Efremov, Peter Schweitzer, and Oleg Teryaev
Subjects: Quark, Physics, Angular momentum, Particle physics, Quark model, High Energy Physics - Lattice (hep-lat), High Energy Physics::Phenomenology, FOS: Physical sciences, Parton, Nucleon spin structure, High Energy Physics - Experiment, High Energy Physics - Experiment (hep-ex), High Energy Physics - Phenomenology, Distribution function, High Energy Physics - Phenomenology (hep-ph), High Energy Physics - Lattice, Transverse momentum, High Energy Physics::Experiment
Abstract: It is known how to access information on quark orbital angular momentum from generalized parton distribution functions, in a certain specified framework. It is intuitively expected, that such information can be accessed also through transverse momentum dependent distribution functions, but not known how. Now quark models provide promising hints. Recent results are reviewed., proceeding of the "4th Workshop on Exclusive Reactions at High Momentum Transfer," 18-21 May 2010, Jefferson Lab
Published: 2010

95. Measurement of Single and Double Spin Asymmetries in Deep Inelastic Pion Electroproduction with a Longitudinally Polarized Target

Author: Latifa Elouadrhiri, C. A. Meyer, K. P. Adhikari, E. Seder, K. Livingston, N. Dashyan, Y. Prok, H. S. Jo, P. Collins, P. Eugenio, M. Mayer, V. Kuznetsov, S. Niccolai, Daniel S. Carman, M. J. Amaryan, Y. Ilieva, R. G. Fersch, Z. W. Zhao, A. Deur, N. Guler, G. E. Dodge, H. Baghdasaryan, M. Guidal, H. Moutarde, J. Zhang, P. Rossi, P. Konczykowski, J. Salamanca, J. Ball, F. X. Girod, S. Park, Larry Weinstein, H. Seraydaryan, B. Vernarsky, D. Heddle, I. Niculescu, S. Procureur, D. Protopopescu, Michael Vineyard, B. Morrison, D. P. Watts, E. De Sanctis, S. Dhamija, Y. G. Sharabian, D. Martinez, S. Fegan, R. A. Schumacher, V. Crede, S. Stepanyan, R. Dickson, E. Voutier, M. Aghasyan, M. Taiuti, R. W. Gothe, B. Dey, N. Markov, H. Hakobyan, S. Anefalos Pereira, L. Guo, D. Doughty, M. Ungaro, D. Keller, R. Nasseripour, J. W. Price, S. S. Stepanyan, E. Pasyuk, M. R. Niroula, A. El Alaoui, B. A. Raue, M. Y. Gabrielyan, T. A. Forest, P. Nadel-Turonski, B. Zhao, S. Tkachenko, G. Ricco, Philip L. Cole, Avraham Klein, M. Ripani, T. Mineeva, S. S. Jawalkar, M. S. Saini, G. Rosner, G. Gavalian, D. J. Tedeschi, Friedrich Klein, I. Bedlinskiy, P. Bosted, E. Munevar, B. Moreno, M. Mirazita, M. Holtrop, C. Salgado, A. Daniel, Chaden Djalali, D. G. Crabb, S. E. Kuhn, M. E. McCracken, M. Anghinolfi, L. Casey, K. Moriya, N. Hassall, C. Hanretty, Y. Perrin, F. Sabatié, W. J. Briscoe, Victor Mokeev, K. Joo, K. L. Giovanetti, S. V. Kuleshov, H. Y. Lu, D. P. Weygand, M. Battaglieri, M. Osipenko, W. Kim, G. Niculescu, A. I. Ostrovidov, K. Park, D. G. Ireland, P. Khetarpal, Volker D. Burkert, A. S. Biselli, A. Fradi, R. De Vita, R. Suleiman, S. Pisano, K.H. Hicks, D. I. Sober, P. Stoler, K. A. Griffioen, S. Strauch, R. Paremuzyan, Gerard Gilfoyle, D. Sokhan, B. McKinnon, D. Branford, N. Gevorgyan, H. Avakian, W. K. Brooks, V. P. Kubarovsky, Annalisa D'Angelo, J. McAndrew, Michael Wood, K. Hafidi, E. L. Isupov, W. Gohn, R. Dupre, O. Pogorelko, M. Khandaker, Département de Physique Nucléaire (ex SPhN) (DPHN), Institut de Recherches sur les lois Fondamentales de l'Univers (IRFU), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, Laboratoire de Physique Subatomique et de Cosmologie (LPSC), Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Institut Polytechnique de Grenoble - Grenoble Institute of Technology-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Joseph Fourier - Grenoble 1 (UJF)-Centre National de la Recherche Scientifique (CNRS), Institut de Physique Nucléaire d'Orsay (IPNO), Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11), CLAS, Université Joseph Fourier - Grenoble 1 (UJF)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Institut Polytechnique de Grenoble - Grenoble Institute of Technology-Centre National de la Recherche Scientifique (CNRS), and Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)
Subjects: Particle physics, Meson, DRELL-YAN, Hadron, General Physics and Astronomy, FOS: Physical sciences, Inelastic scattering, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 01 natural sciences, Settore FIS/04 - Fisica Nucleare e Subnucleare, High Energy Physics - Experiment, Nuclear physics, High Energy Physics - Experiment (hep-ex), Pion, DEPENDENCE, CLAS, 0103 physical sciences, [PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex], SCATTERING, DISTRIBUTIONS, Nuclear Experiment (nucl-ex), 010306 general physics, FINAL-STATE INTERACTIONS, TRANSVERSE-MOMENTUM, AZIMUTHAL ASYMMETRIES, DRELL-YAN, SCATTERING, DISTRIBUTIONS, QUARK, DEPENDENCE, CLAS, QCD, Nuclear Experiment, Spin-½, Physics, FINAL-STATE INTERACTIONS, 010308 nuclear & particles physics, QUARK, TRANSVERSE-MOMENTUM, Deep inelastic scattering, AZIMUTHAL ASYMMETRIES, QCD, Physics::Accelerator Physics, High Energy Physics::Experiment, Nucleon, Lepton
Abstract: We report the first measurement of the transverse momentum dependence of double-spin asymmetries in semi-inclusive production of pions in deep-inelastic scattering off the longitudinally polarized proton. Data have been obtained using a polarized electron beam of 5.7 GeV with the CLAS detector at the Jefferson Lab (JLab). Modulations of single spin asymmetries over the azimuthal angle between lepton scattering and hadron production planes phi have been measured over a wide kinematic range in Bjorken x and virtual photon squared four-momentum Q(2). A significant nonzero sin2 phi single spin asymmetry was observed for the first time indicating strong spin-orbit correlations for transversely polarized quarks in the longitudinally polarized proton.
Published: 2010

96. A short variant of A9 that is identical to A9V2

Author: A. H. Rice, Hemantkumar Patel, H. Avakian, and J. M. Goldman
Subjects: Genetics, Immunology, Haplotype, Immunology and Allergy, General Medicine, Biology, Biochemistry
Published: 1992

97. Precise Measurement of the Neutron Magnetic Form FactorGMnin the Few-GeV2Region

Author: R. J. Feuerbach, J. P. Cummings, L. C. Smith, E. Munevar, R. De Masi, D. Keller, M. Kossov, B. S. Ishkhanov, I. Popa, K. S. Egiyan, G. Ricco, K. Mikhailov, L. Cheng, M. Khandaker, M. Garçon, J. Shaw, Michael Wood, P. Nadel-Turonski, Nikolay Shvedunov, M. R. Niroula, K. Hafidi, R. Nasseripour, S. McAleer, Friedrich Klein, B. P. Quinn, Brian Raue, V. S. Serov, L. Casey, F. X. Girod, Susan Taylor, Marco A. Huertas, M. Lowry, V. Sapunenko, D. P. Watts, L. C. Dennis, B. E. Bonner, Hartmuth Arenhövel, Dinko Pocanic, H. Egiyan, R. G. Fersch, H. Avakian, D. Doughty, B. B. Niczyporuk, G. S. Adams, S. Park, D. Sharov, N. Kalantarians, P. L. Cole, Sylvain Bouchigny, Sabine Jeschonnek, R. C. Minehart, Kei Moriya, D. Heddle, P. Rossi, J. Lachniet, H. G. Juengst, C. A. Meyer, N. Pivnyuk, K. Joo, W. J. Briscoe, B. L. Berman, A. Tkabladze, G. V. Fedotov, E. Pasyuk, D. Rowntree, A. Coleman, L. M. Qin, M. Y. Gabrielyan, S. E. Kuhn, S. A. Dytman, V. Crede, Y. Ilieva, J. R. Calarco, T. Mineeva, J. W. Price, M. J. Amaryan, C. Paterson, S. Strauch, M. MacCormick, A.V. Stavinsky, M. Klusman, I. Hleiqawi, V. P. Kubarovsky, K. P. Adhikari, S. L. Careccia, A. Empl, L. El Fassi, O. Pogorelko, B. Moreno, D. P. Weygand, J. Salamanca, R. Suleiman, M. E. McCracken, Elton Smith, K. L. Giovanetti, B. Asavapibhop, G. V. O'Rielly, Tsutomu Mibe, Larry Weinstein, Z. W. Zhao, J. W C McNabb, D. J. Tedeschi, D. Protopopescu, D. G. Jenkins, Barry Ritchie, M. Anghinolfi, James Mueller, S. Malace, S. A. Morrow, P. Rubin, I. Bedlinskiy, G. S. Mutchler, Konstantin Stopani, S. Pozdniakov, V. Gyurjyan, M. M. Ito, C. Djalali, Y. G. Sharabian, G. Rosner, T. Kageya, K. Livingston, D. S. Dale, X. Wei, R. Dickson, V. Kuznetsov, C. E. Hyde-Wright, H. Denizli, N. Guler, N. A. Baltzell, P. Mattione, K. A. Griffioen, M. S. Saini, A. V. Skabelin, P. Dragovitsch, J. Zhang, S. Barrow, E. De Sanctis, S. Niccolai, J. T. Goetz, E. Polli, H. Bagdasaryan, R. A. Miskimen, J. D. Kellie, B. McKinnon, Sergey Kuleshov, M. Bektasoglu, J. Hardie, M. Nozar, W. Kim, Laird Kramer, G. Niculescu, D. I. Sober, D. Branford, M. Guidal, R. A. Schumacher, H. Hakobyan, M. Mirazita, P. Khetarpal, C. Hanretty, J. M. Laget, M. Holtrop, Victor Mokeev, L. Graham, J. R. Johnstone, N. Gevorgyan, L. Guo, M. Ungaro, M. Osipenko, F. Sabatié, A. Daniel, K. Beard, Kalvir S. Dhuga, S. Bültmann, A. I. Ostrovidov, J. Yun, D. Cords, V. Batourine, T. A. Forest, A. Yegneswaran, A. C S Lima, A. Sandorfi, K. Park, R. Fatemi, S. Stepanyan, A. V. Vlassov, D. G. Ireland, Volker D. Burkert, A. S. Biselli, J. Pierce, Avraham Klein, B. Zhao, J. Langheinrich, R. De Vita, A. Fradi, S. S. Stepanyan, S. A. Philips, William Brooks, N. Markov, P. Konczykowski, B. E. Stokes, J. J. Manak, S. Anefalos Pereira, G. E. Dodge, H. Y. Lu, N. Dashyan, Maryam Moteabbed, P. V. Degtyarenko, K. V. Dharmawardane, I. Niculescu, D. Lawrence, D. Schott, F. W. Hersman, M. Battaglieri, N. Baillie, P. Stoler, K. Hicks, G. Asryan, O. P. Dzyubak, R. A. Niyazov, P. Corvisiero, R. Bradford, B. A. Mecking, K. Lukashin, E. Wolin, Gerard Gilfoyle, M. Guillo, D. Sokhan, W. Gohn, N. Hassall, M. Bellis, E. Golovatch, J. P. Ball, J. Hu, Y. Prok, D. S. Carman, S. Dhamija, M. D. Mestayer, L. Elouadrhiri, I. I. Strakovsky, E. L. Isupov, R. W. Gothe, G. Gavalian, S. Tkachenko, A. Deur, Michael L. Williams, J. Kuhn, N. Benmouna, J. P. Santoro, Andrei Afanasev, M. Ripani, D. G. Crabb, K. Y. Kim, Roy Thompson, Cynthia Marie Hadjidakis, S. Boiarinov, Michael Dugger, B. M. Preedom, Douglas Higinbotham, M. Yurov, Lorenzo Zana, H. S. Jo, C. Bookwalter, C. Salgado, Kwangsoo Kim, G. Riccardi, P. Eugenio, A. Starostin, M. Taiuti, Michael Vineyard, and P. Collins
Subjects: Physics, 010308 nuclear & particles physics, Scattering, Nuclear Theory, General Physics and Astronomy, Scintillator, 7. Clean energy, 01 natural sciences, Nuclear physics, Dipole, Deuterium, 0103 physical sciences, Magnetic form factor, Neutron detection, High Energy Physics::Experiment, Neutron, Nuclear Experiment, 010306 general physics, Electron scattering
Abstract: The neutron elastic magnetic form factor was extracted from quasielastic electron scattering on deuterium over the range Q;{2}=1.0-4.8 GeV2 with the CLAS detector at Jefferson Lab. High precision was achieved with a ratio technique and a simultaneous in situ calibration of the neutron detection efficiency. Neutrons were detected with electromagnetic calorimeters and time-of-flight scintillators at two beam energies. The dipole parametrization gives a good description of the data.
Published: 2009

98. PRETZELOSITY DISTRIBUTION FUNCTION $h_{1T}^ \bot $

Author: H. Avakian, Feng Yuan, Peter Schweitzer, and A.V. Efremov
Subjects: Physics, Particle physics, Distribution function, Distribution (number theory), Transverse momentum, Parton, Twist, Nuclear Experiment, Helicity
Abstract: The 'pretzelosity' distribution is discussed. Theoretical properties, model results, and perspectives to access experimental information on this leading twist, transverse momentum dependent parton distribution function are reviewed. Its relation to helicity and transversity distributions is highlighted.
Published: 2009

99. TMD MEASUREMENTS AT CLAS6 AND CLAS12

Author: H. Avakian
Subjects: Physics, Nuclear magnetic resonance, Spin polarization
Published: 2009

100. Search for the Photoexcitation of Exotic Mesons in theπ+π+π−System

Author: M. Nozar, C. Salgado, D. P. Weygand, L. Guo, G. Adams, Ji Li, P. Eugenio, M. J. Amaryan, M. Anghinolfi, G. Asryan, H. Avakian, H. Bagdasaryan, N. Baillie, J. P. Ball, N. A. Baltzell, S. Barrow, M. Battaglieri, I. Bedlinskiy, M. Bektasoglu, M. Bellis, N. Benmouna, B. L. Berman, A. S. Biselli, L. Blaszczyk, B. E. Bonner, S. Bouchigny, S. Boiarinov, R. Bradford, D. Branford, W. J. Briscoe, W. K. Brooks, S. Bültmann, V. D. Burkert, C. Butuceanu, J. R. Calarco, S. L. Careccia, D. S. Carman, B. Carnahan, L. Casey, A. Cazes, S. Chen, L. Cheng, P. L. Cole, P. Collins, P. Coltharp, D. Cords, P. Corvisiero, D. Crabb, H. Crannell, V. Crede, J. P. Cummings, D. Dale, N. Dashyan, R. De Masi, R. De Vita, E. De Sanctis, P. V. Degtyarenko, H. Denizli, L. Dennis, A. Deur, K. V. Dharmawardane, K. S. Dhuga, R. Dickson, C. Djalali, G. E. Dodge, D. Doughty, M. Dugger, S. Dytman, O. P. Dzyubak, H. Egiyan, K. S. Egiyan, L. El Fassi, L. Elouadrhiri, R. Fatemi, G. Fedotov, R. J. Feuerbach, T. A. Forest, A. Fradi, H. Funsten, M. Garçon, G. Gavalian, N. Gevorgyan, G. P. Gilfoyle, K. L. Giovanetti, F. X. Girod, J. T. Goetz, R. W. Gothe, K. A. Griffioen, M. Guidal, M. Guillo, N. Guler, V. Gyurjyan, C. Hadjidakis, K. Hafidi, H. Hakobyan, C. Hanretty, J. Hardie, N. Hassall, D. Heddle, F. W. Hersman, K. Hicks, I. Hleiqawi, M. Holtrop, C. E. Hyde-Wright, Y. Ilieva, D. G. Ireland, B. S. Ishkhanov, E. L. Isupov, M. M. Ito, D. Jenkins, H. S. Jo, J. R. Johnstone, K. Joo, H. G. Juengst, N. Kalantarians, J. D. Kellie, M. Khandaker, W. Kim, A. Klein, F. J. Klein, M. Kossov, Z. Krahn, L. H. Kramer, V. Kubarovsky, J. Kuhn, S. E. Kuhn, S. V. Kuleshov, V. Kuznetsov, J. Lachniet, J. M. Laget, J. Langheinrich, D. Lawrence, K. Livingston, H. Y. Lu, M. MacCormick, N. Markov, P. Mattione, S. McAleer, B. McKinnon, J. W. C. McNabb, B. A. Mecking, S. Mehrabyan, M. D. Mestayer, C. A. Meyer, T. Mibe, K. Mikhailov, M. Mirazita, R. Miskimen, V. Mokeev, B. Moreno, K. Moriya, S. A. Morrow, M. Moteabbed, J. Mueller, E. Munevar, G. S. Mutchler, P. Nadel-Turonski, R. Nasseripour, S. Niccolai, G. Niculescu, I. Niculescu, B. B. Niczyporuk, M. R. Niroula, R. A. Niyazov, G. V. O’Rielly, M. Osipenko, A. I. Ostrovidov, K. Park, E. Pasyuk, C. Paterson, S. Anefalos Pereira, S. A. Philips, J. Pierce, N. Pivnyuk, D. Pocanic, O. Pogorelko, E. Polli, I. Popa, S. Pozdniakov, B. M. Preedom, J. W. Price, Y. Prok, D. Protopopescu, L. M. Qin, B. A. Raue, G. Riccardi, G. Ricco, M. Ripani, B. G. Ritchie, F. Ronchetti, G. Rosner, P. Rossi, P. D. Rubin, F. Sabatié, J. Salamanca, J. P. Santoro, V. Sapunenko, R. A. Schumacher, V. S. Serov, Y. G. Sharabian, D. Sharov, N. V. Shvedunov, A. V. Skabelin, E. S. Smith, L. C. Smith, D. I. Sober, D. Sokhan, A. Stavinsky, S. S. Stepanyan, S. Stepanyan, B. E. Stokes, P. Stoler, I. I. Strakovsky, S. Strauch, M. Taiuti, D. J. Tedeschi, U. Thoma, A. Tkabladze, S. Tkachenko, L. Todor, M. Ungaro, M. F. Vineyard, A. V. Vlassov, D. P. Watts, L. B. Weinstein, M. Williams, E. Wolin, M. H. Wood, A. Yegneswaran, L. Zana, J. Zhang, B. Zhao, and Z. W. Zhao
Subjects: Quantum chromodynamics, Physics, Particle physics, Meson, 010308 nuclear & particles physics, Partial wave analysis, Bremsstrahlung, General Physics and Astronomy, 01 natural sciences, 7. Clean energy, Nuclear physics, Excited state, 0103 physical sciences, Isobar, Production (computer science), 010306 general physics, Spin-½
Abstract: A search for exotic mesons in the $$\pi^{+}\pi^{+}\pi^{-}$$ system photoproduced by the charge exchange reaction $$\gamma p\to \pi^{+}\pi^{+}\pi^{-}(n)$$ was carried out by the CLAS collaboration at Jefferson Lab. A tagged-photon beam with energies in the 4.8 to 5.4 GeV range, produced through bremsstrahlung from a 5.744 GeV electron beam, was incident on a liquid-hydrogen target. A Partial Wave Analysis (PWA) was performed on a sample of 83,000 events, the highest such statistics to date in this reaction at these energies. The main objective of this study was to look for the photoproduction of an exotic $$J^{PC} = 1^{-+}$$ resonant state in the 1 to 2 GeV mass range. Our PWA analysis, based on the isobar model, shows production of the $$a_{2}(1320)$$ and the $$\pi_{2}(1670)$$ mesons, but no evidence for the $$a_{1}(1260)$$, nor the $$\pi_{1}(1600)$$ exotic state at the expected levels. An upper limit of 13.5 nb is determined for the exotic $$\pi_1(1600)$$ cross section, less than 2% of the $a_2(1320)
Published: 2009

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